diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2b6601d..6217dddf 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 6.0.0-beta.22
+
+- Updated `window.flutter_inappwebview.callHandler` implementation: if there is an error/exception on Flutter/Dart side, the `callHandler` will reject the JavaScript promise with the error/exception message, so you can catch it also on JavaScript side
+- Fixed Android Web Storage Manager `deleteAllData` and `deleteOrigin` methods implementation
+- Fixed "Xiaomi store - Conflict of Privacy Permissions, android.permission.MY_READ_INSTALLED_PACKAGES" [#1462](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1462)
+- Fixed "Flutter 3.0.5 compilation issue" [#1475](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1475)
+
 ## 6.0.0-beta.21
 
 - Fixed "Android plugin version 6 - UserScripts not executing on new tabs." [#1455](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1455)
@@ -174,6 +181,10 @@
 - Removed `URLProtectionSpace.iosIsProxy` property
 - `historyUrl` and `baseUrl` of `InAppWebViewInitialData` can be `null`
 
+## 5.7.2+3
+
+- Fixed "Xiaomi store - Conflict of Privacy Permissions, android.permission.MY_READ_INSTALLED_PACKAGES" [#1462](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1462)
+
 ## 5.7.2+2
 
 - Fixed "Unexpected addWebMessageListener behaviour" [#1422](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1422)
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyCookieManager.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyCookieManager.java
index dde98e41..20ef995c 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyCookieManager.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyCookieManager.java
@@ -30,14 +30,21 @@ public class MyCookieManager extends ChannelDelegateImpl {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public MyCookieManager(final InAppWebViewFlutterPlugin plugin) {
+  public MyCookieManager(@NonNull final InAppWebViewFlutterPlugin plugin) {
     super(new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME));
     this.plugin = plugin;
-    cookieManager = getCookieManager();
+  }
+
+  public static void init() {
+    if (cookieManager == null) {
+      cookieManager = getCookieManager();
+    }
   }
 
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    init();
+
     switch (call.method) {
       case "setCookie":
         {
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyWebStorage.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyWebStorage.java
index b9ff890a..ad3cc982 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyWebStorage.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyWebStorage.java
@@ -25,20 +25,27 @@ public class MyWebStorage extends ChannelDelegateImpl {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public MyWebStorage(final InAppWebViewFlutterPlugin plugin) {
+  public MyWebStorage(@NonNull final InAppWebViewFlutterPlugin plugin) {
     super(new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME));
     this.plugin = plugin;
-    webStorageManager = WebStorage.getInstance();
+  }
+
+  public static void init() {
+    if (webStorageManager == null) {
+      webStorageManager = WebStorage.getInstance();
+    }
   }
 
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    init();
+
     switch (call.method) {
       case "getOrigins":
         getOrigins(result);
         break;
       case "deleteAllData":
-        if (webStorageManager == null) {
+        if (webStorageManager != null) {
           webStorageManager.deleteAllData();
           result.success(true);
         } else {
@@ -47,7 +54,7 @@ public class MyWebStorage extends ChannelDelegateImpl {
         break;
       case "deleteOrigin":
         {
-          if (webStorageManager == null) {
+          if (webStorageManager != null) {
             String origin = (String) call.argument("origin");
             webStorageManager.deleteOrigin(origin);
             result.success(true);
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/WebViewFeatureManager.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/WebViewFeatureManager.java
index ac38dd94..17f57baf 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/WebViewFeatureManager.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/WebViewFeatureManager.java
@@ -16,7 +16,7 @@ public class WebViewFeatureManager extends ChannelDelegateImpl {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public WebViewFeatureManager(final InAppWebViewFlutterPlugin plugin) {
+  public WebViewFeatureManager(@NonNull final InAppWebViewFlutterPlugin plugin) {
     super(new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME));
     this.plugin = plugin;
   }
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/credential_database/CredentialDatabaseHandler.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/credential_database/CredentialDatabaseHandler.java
index bb532a9e..eb1df65d 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/credential_database/CredentialDatabaseHandler.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/credential_database/CredentialDatabaseHandler.java
@@ -30,14 +30,23 @@ public class CredentialDatabaseHandler extends ChannelDelegateImpl {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public CredentialDatabaseHandler(final InAppWebViewFlutterPlugin plugin) {
+  public CredentialDatabaseHandler(@NonNull final InAppWebViewFlutterPlugin plugin) {
     super(new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME));
     this.plugin = plugin;
-    credentialDatabase = CredentialDatabase.getInstance(plugin.applicationContext);
+  }
+
+  public static void init(@NonNull InAppWebViewFlutterPlugin plugin) {
+    if (credentialDatabase == null) {
+      credentialDatabase = CredentialDatabase.getInstance(plugin.applicationContext);
+    }
   }
 
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    if (plugin != null) {
+      init(plugin);
+    }
+
     switch (call.method) {
       case "getAllAuthCredentials":
         {
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/plugin_scripts_js/JavaScriptBridgeJS.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/plugin_scripts_js/JavaScriptBridgeJS.java
index 792e5b1d..cfdf656d 100644
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/plugin_scripts_js/JavaScriptBridgeJS.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/plugin_scripts_js/JavaScriptBridgeJS.java
@@ -220,7 +220,7 @@ public class JavaScriptBridgeJS {
           "      var _callHandlerID = setTimeout(function(){});" +
           "      window." + JAVASCRIPT_BRIDGE_NAME + "._callHandler(arguments[0], _callHandlerID, JSON.stringify(Array.prototype.slice.call(arguments, 1)));" +
           "      return new Promise(function(resolve, reject) {" +
-          "        window." + JAVASCRIPT_BRIDGE_NAME + "[_callHandlerID] = resolve;" +
+          "        window." + JAVASCRIPT_BRIDGE_NAME + "[_callHandlerID] = {resolve: resolve, reject: reject};" +
           "      });" +
           "    };" +
           "  }"+
@@ -230,7 +230,7 @@ public class JavaScriptBridgeJS {
           "    var _callHandlerID = setTimeout(function(){});" +
           "    window.top." + JAVASCRIPT_BRIDGE_NAME + "._callHandler(arguments[0], _callHandlerID, JSON.stringify(Array.prototype.slice.call(arguments, 1)));" +
           "    return new Promise(function(resolve, reject) {" +
-          "      window.top." + JAVASCRIPT_BRIDGE_NAME + "[_callHandlerID] = resolve;" +
+          "      window.top." + JAVASCRIPT_BRIDGE_NAME + "[_callHandlerID] = {resolve: resolve, reject: reject};" +
           "    });" +
           "  };" +
           "}" +
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/proxy/ProxyManager.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/proxy/ProxyManager.java
index f2b5b07f..6b3b4a00 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/proxy/ProxyManager.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/proxy/ProxyManager.java
@@ -25,18 +25,22 @@ public class ProxyManager extends ChannelDelegateImpl {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public ProxyManager(final InAppWebViewFlutterPlugin plugin) {
+  public ProxyManager(@NonNull final InAppWebViewFlutterPlugin plugin) {
     super(new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME));
     this.plugin = plugin;
-    if (WebViewFeature.isFeatureSupported(WebViewFeature.PROXY_OVERRIDE)) {
+  }
+
+  public static void init() {
+    if (proxyController == null &&
+            WebViewFeature.isFeatureSupported(WebViewFeature.PROXY_OVERRIDE)) {
       proxyController = ProxyController.getInstance();
-    } else {
-      proxyController = null;
     }
   }
 
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    init();
+
     switch (call.method) {
       case "setProxyOverride":
         if (proxyController != null) {
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerChannelDelegate.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerChannelDelegate.java
index 7c6a1b04..c59ea010 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerChannelDelegate.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerChannelDelegate.java
@@ -36,6 +36,7 @@ public class ServiceWorkerChannelDelegate extends ChannelDelegateImpl {
   @SuppressLint("RestrictedApi")
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    ServiceWorkerManager.init();
     ServiceWorkerControllerCompat serviceWorkerController = ServiceWorkerManager.serviceWorkerController;
     ServiceWorkerWebSettingsCompat serviceWorkerWebSettings = (serviceWorkerController != null) ? 
             serviceWorkerController.getServiceWorkerWebSettings() : null;
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerManager.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerManager.java
index b188ab0e..74a52800 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerManager.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/service_worker/ServiceWorkerManager.java
@@ -33,14 +33,16 @@ public class ServiceWorkerManager implements Disposable {
   @Nullable
   public InAppWebViewFlutterPlugin plugin;
 
-  public ServiceWorkerManager(final InAppWebViewFlutterPlugin plugin) {
+  public ServiceWorkerManager(@NonNull final InAppWebViewFlutterPlugin plugin) {
     this.plugin = plugin;
     final MethodChannel channel = new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME);
     this.channelDelegate = new ServiceWorkerChannelDelegate(this, channel);
-    if (WebViewFeature.isFeatureSupported(WebViewFeature.SERVICE_WORKER_BASIC_USAGE)) {
+  }
+
+  public static void init() {
+    if (serviceWorkerController == null &&
+            WebViewFeature.isFeatureSupported(WebViewFeature.SERVICE_WORKER_BASIC_USAGE)) {
       serviceWorkerController = ServiceWorkerControllerCompat.getInstance();
-    } else {
-      serviceWorkerController = null;
     }
   }
   
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerChannelDelegate.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerChannelDelegate.java
index d5e136a2..92293875 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerChannelDelegate.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerChannelDelegate.java
@@ -27,6 +27,7 @@ public class TracingControllerChannelDelegate extends ChannelDelegateImpl {
 
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+    TracingControllerManager.init();
     TracingController tracingController = TracingControllerManager.tracingController;
 
     switch (call.method) {
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerManager.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerManager.java
index 77aa3f99..3f46efa3 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerManager.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/tracing/TracingControllerManager.java
@@ -1,6 +1,7 @@
 package com.pichillilorenzo.flutter_inappwebview.tracing;
 
 import androidx.annotation.Nullable;
+import androidx.webkit.ProxyController;
 import androidx.webkit.TracingConfig;
 import androidx.webkit.TracingController;
 import androidx.webkit.WebViewFeature;
@@ -25,10 +26,12 @@ public class TracingControllerManager implements Disposable {
     this.plugin = plugin;
     final MethodChannel channel = new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME);
     this.channelDelegate = new TracingControllerChannelDelegate(this, channel);
-    if (WebViewFeature.isFeatureSupported(WebViewFeature.TRACING_CONTROLLER_BASIC_USAGE)) {
+  }
+
+  public static void init() {
+    if (tracingController == null &&
+            WebViewFeature.isFeatureSupported(WebViewFeature.TRACING_CONTROLLER_BASIC_USAGE)) {
       tracingController = TracingController.getInstance();
-    } else {
-      tracingController = null;
     }
   }
 
diff --git a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/webview/JavaScriptBridgeInterface.java b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/webview/JavaScriptBridgeInterface.java
index 1eb0cede..fd872fa1 100755
--- a/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/webview/JavaScriptBridgeInterface.java
+++ b/android/src/main/java/com/pichillilorenzo/flutter_inappwebview/webview/JavaScriptBridgeInterface.java
@@ -130,7 +130,7 @@ public class JavaScriptBridgeInterface {
                 return;
               }
               String sourceCode = "if (window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "] != null) { " +
-                "window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "](" + json + "); " +
+                "window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "].resolve(" + json + "); " +
                 "delete window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "]; " +
               "}";
               if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
@@ -143,7 +143,24 @@ public class JavaScriptBridgeInterface {
 
             @Override
             public void error(String errorCode, @Nullable String errorMessage, @Nullable Object errorDetails) {
-              Log.e(LOG_TAG, errorCode + ", " + ((errorMessage != null) ? errorMessage : ""));
+              String message = errorCode + ((errorMessage != null) ? ", " + errorMessage : "");
+              Log.e(LOG_TAG, message);
+
+              if (inAppWebView == null) {
+                // The webview has already been disposed, ignore.
+                return;
+              }
+
+              String sourceCode = "if (window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "] != null) { " +
+                      "window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "].reject(new Error(" + JSONObject.quote(message) + ")); " +
+                      "delete window." + JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME + "[" + _callHandlerID + "]; " +
+                      "}";
+              if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+                inAppWebView.evaluateJavascript(sourceCode, (ValueCallback<String>) null);
+              }
+              else {
+                inAppWebView.loadUrl("javascript:" + sourceCode);
+              }
             }
           });
         }
diff --git a/example/integration_test/chrome_safari_browser/open_and_close.dart b/example/integration_test/chrome_safari_browser/open_and_close.dart
index 5b5a4d9e..336a79ef 100644
--- a/example/integration_test/chrome_safari_browser/open_and_close.dart
+++ b/example/integration_test/chrome_safari_browser/open_and_close.dart
@@ -45,7 +45,7 @@ void openAndClose() {
             activityButton: ActivityButton(
                 templateImage: UIImage(systemName: "sun.max"),
                 extensionIdentifier:
-                    "com.pichillilorenzo.flutter-inappwebview6-example.test")));
+                    "com.pichillilorenzo.flutter-inappwebview-example6.test")));
     await chromeSafariBrowser.opened.future;
     expect(chromeSafariBrowser.isOpened(), true);
     expect(() async {
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
index 52e55bba..48d9b6a7 100644
--- a/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -451,7 +451,7 @@
 				MARKETING_VERSION = 1.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview6-example.test";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview-example6.test";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
@@ -484,7 +484,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @executable_path/../../Frameworks";
 				MARKETING_VERSION = 1.0;
 				MTL_FAST_MATH = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview6-example.test";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview-example6.test";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_EMIT_LOC_STRINGS = YES;
@@ -627,7 +627,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview6-example";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview-example6";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
@@ -659,7 +659,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview6-example";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.pichillilorenzo.flutter-inappwebview-example6";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
diff --git a/ios/Classes/InAppWebView/InAppWebView.swift b/ios/Classes/InAppWebView/InAppWebView.swift
index 1506aab5..d8733865 100755
--- a/ios/Classes/InAppWebView/InAppWebView.swift
+++ b/ios/Classes/InAppWebView/InAppWebView.swift
@@ -2738,13 +2738,21 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
                 
                 self.evaluateJavaScript("""
 if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
-    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)](\(json));
+    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)].resolve(\(json));
     delete window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)];
 }
 """, completionHandler: nil)
             }
             callback.error = { (code: String, message: String?, details: Any?) in
-                print(code + ", " + (message ?? ""))
+                let errorMessage = code + (message != nil ? ", " + (message ?? "") : "")
+                print(errorMessage)
+                
+                self.evaluateJavaScript("""
+if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
+    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)].reject(new Error('\(errorMessage.replacingOccurrences(of: "\'", with: "\\'"))'));
+    delete window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)];
+}
+""", completionHandler: nil)
             }
             
             if let channelDelegate = webView.channelDelegate {
diff --git a/ios/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift b/ios/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
index cddca764..1549c28b 100644
--- a/ios/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
+++ b/ios/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
@@ -26,7 +26,7 @@ window.\(JAVASCRIPT_BRIDGE_NAME).callHandler = function() {
     var _callHandlerID = setTimeout(function(){});
     window.webkit.messageHandlers['callHandler'].postMessage( {'handlerName': arguments[0], '_callHandlerID': _callHandlerID, 'args': JSON.stringify(Array.prototype.slice.call(arguments, 1)), '_windowId': _windowId} );
     return new Promise(function(resolve, reject) {
-        window.\(JAVASCRIPT_BRIDGE_NAME)[_callHandlerID] = resolve;
+        window.\(JAVASCRIPT_BRIDGE_NAME)[_callHandlerID] = {resolve: resolve, reject: reject};
     });
 };
 \(WEB_MESSAGE_LISTENER_JS_SOURCE)
diff --git a/lib/src/in_app_browser/in_app_browser.dart b/lib/src/in_app_browser/in_app_browser.dart
index 3fd65997..30199275 100755
--- a/lib/src/in_app_browser/in_app_browser.dart
+++ b/lib/src/in_app_browser/in_app_browser.dart
@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:collection';
 import 'dart:typed_data';
+import 'dart:ui';
 
 import 'package:flutter/services.dart';
 
diff --git a/lib/src/in_app_webview/in_app_webview_controller.dart b/lib/src/in_app_webview/in_app_webview_controller.dart
index 50703aab..12ff13a7 100644
--- a/lib/src/in_app_webview/in_app_webview_controller.dart
+++ b/lib/src/in_app_webview/in_app_webview_controller.dart
@@ -1378,9 +1378,10 @@ class InAppWebViewController {
           // convert result to json
           try {
             return jsonEncode(await javaScriptHandlersMap[handlerName]!(args));
-          } catch (error) {
-            developer.log(error.toString(), name: this.runtimeType.toString());
-            return null;
+          } catch (error, stacktrace) {
+            developer.log(error.toString() + '\n' + stacktrace.toString(),
+                name: 'JavaScript Handler "$handlerName"');
+            throw Exception(error.toString().replaceFirst('Exception: ', ''));
           }
         }
         break;
diff --git a/lib/src/in_app_webview/in_app_webview_settings.dart b/lib/src/in_app_webview/in_app_webview_settings.dart
index a0c4eb30..b5bb9f74 100755
--- a/lib/src/in_app_webview/in_app_webview_settings.dart
+++ b/lib/src/in_app_webview/in_app_webview_settings.dart
@@ -2,6 +2,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_inappwebview/src/types/user_preferred_content_mode.dart';
 import 'package:flutter_inappwebview_internal_annotations/flutter_inappwebview_internal_annotations.dart';
+import 'dart:typed_data';
 
 import '../android/webview_asset_loader.dart';
 import '../types/action_mode_menu_item.dart';
diff --git a/macos/Classes/InAppWebView/InAppWebView.swift b/macos/Classes/InAppWebView/InAppWebView.swift
index 5c8bf04f..4c0b8944 100755
--- a/macos/Classes/InAppWebView/InAppWebView.swift
+++ b/macos/Classes/InAppWebView/InAppWebView.swift
@@ -2102,13 +2102,21 @@ public class InAppWebView: WKWebView, WKUIDelegate,
                 
                 self.evaluateJavaScript("""
 if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
-    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)](\(json));
+    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)].resolve(\(json));
     delete window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)];
 }
 """, completionHandler: nil)
             }
             callback.error = { (code: String, message: String?, details: Any?) in
-                print(code + ", " + (message ?? ""))
+                let errorMessage = code + (message != nil ? ", " + (message ?? "") : "")
+                print(errorMessage)
+                
+                self.evaluateJavaScript("""
+if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
+    window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)].reject(new Error('\(errorMessage.replacingOccurrences(of: "\'", with: "\\'"))'));
+    delete window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)];
+}
+""", completionHandler: nil)
             }
             
             if let channelDelegate = webView.channelDelegate {
diff --git a/macos/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift b/macos/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
index cddca764..1549c28b 100644
--- a/macos/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
+++ b/macos/Classes/PluginScriptsJS/JavaScriptBridgeJS.swift
@@ -26,7 +26,7 @@ window.\(JAVASCRIPT_BRIDGE_NAME).callHandler = function() {
     var _callHandlerID = setTimeout(function(){});
     window.webkit.messageHandlers['callHandler'].postMessage( {'handlerName': arguments[0], '_callHandlerID': _callHandlerID, 'args': JSON.stringify(Array.prototype.slice.call(arguments, 1)), '_windowId': _windowId} );
     return new Promise(function(resolve, reject) {
-        window.\(JAVASCRIPT_BRIDGE_NAME)[_callHandlerID] = resolve;
+        window.\(JAVASCRIPT_BRIDGE_NAME)[_callHandlerID] = {resolve: resolve, reject: reject};
     });
 };
 \(WEB_MESSAGE_LISTENER_JS_SOURCE)
diff --git a/pubspec.yaml b/pubspec.yaml
index c1deee90..36f66988 100755
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_inappwebview
 description: A Flutter plugin that allows you to add an inline webview, to use an headless webview, and to open an in-app browser window.
-version: 6.0.0-beta.21
+version: 6.0.0-beta.22
 homepage: https://inappwebview.dev/
 repository: https://github.com/pichillilorenzo/flutter_inappwebview
 issue_tracker: https://github.com/pichillilorenzo/flutter_inappwebview/issues