diff --git a/packages/screen_retriever/lib/src/screen_retriever.dart b/packages/screen_retriever/lib/src/screen_retriever.dart
index d2a093a..5496034 100644
--- a/packages/screen_retriever/lib/src/screen_retriever.dart
+++ b/packages/screen_retriever/lib/src/screen_retriever.dart
@@ -12,7 +12,8 @@ class ScreenRetriever {
 
   /// Handle screen events from the platform side.
   void _handleScreenEvent(event) {
-    String type = event['type'] as String;
+    final type = event['type'] as String?;
+    if (type == null) return;
     for (var listener in _listeners) {
       listener.onScreenEvent(type);
     }