diff --git a/flutter_inappwebview_platform_interface/lib/src/in_app_webview/in_app_webview_keep_alive.dart b/flutter_inappwebview_platform_interface/lib/src/in_app_webview/in_app_webview_keep_alive.dart
index 81dc56f2..cb7328de 100644
--- a/flutter_inappwebview_platform_interface/lib/src/in_app_webview/in_app_webview_keep_alive.dart
+++ b/flutter_inappwebview_platform_interface/lib/src/in_app_webview/in_app_webview_keep_alive.dart
@@ -31,12 +31,12 @@ class InAppWebViewControllerKeepAliveProps {
   Map<String, Function(dynamic data)> devToolsProtocolEventListenerMap;
 
   InAppWebViewControllerKeepAliveProps(
-      {required this.javaScriptHandlersMap,
-      required this.userScripts,
-      required this.webMessageListenerObjNames,
-      required this.injectedScriptsFromURL,
-      required this.webMessageChannels,
-      required this.webMessageListeners,
-      required this.devToolsProtocolEventListenerMap
+      {this.javaScriptHandlersMap = const {},
+      this.userScripts = const {},
+      this.webMessageListenerObjNames = const {},
+      this.injectedScriptsFromURL = const {},
+      this.webMessageChannels = const {},
+      this.webMessageListeners = const {},
+      this.devToolsProtocolEventListenerMap = const {}
       });
 }