[google_maps_flutter] Avoid calling null callbacks

packages/google_maps_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.12
+
+* Prevent calling null callbacks and callbacks on removed objects.
+
 ## 0.5.11+1
 
 * Android: Fix an issue where myLocationButtonEnabled setting was not propagated when set to false onMapLoad.

packages/google_maps_flutter/lib/src/google_map.dart

@@ -248,24 +248,32 @@ class _GoogleMapState extends State<GoogleMap> {
   void onMarkerTap(String markerIdParam) {
     assert(markerIdParam != null);
     final MarkerId markerId = MarkerId(markerIdParam);
-    _markers[markerId].onTap();
+    if (_markers[markerId]?.onTap != null) {
+      _markers[markerId].onTap();
+    }
   }
 
   void onPolylineTap(String polylineIdParam) {
     assert(polylineIdParam != null);
     final PolylineId polylineId = PolylineId(polylineIdParam);
-    _polylines[polylineId].onTap();
+    if (_polylines[polylineId]?.onTap != null) {
+      _polylines[polylineId].onTap();
+    }
   }
 
   void onInfoWindowTap(String markerIdParam) {
     assert(markerIdParam != null);
     final MarkerId markerId = MarkerId(markerIdParam);
-    _markers[markerId].infoWindow.onTap();
+    if (_markers[markerId]?.infoWindow?.onTap != null) {
+      _markers[markerId].infoWindow.onTap();
+    }
   }
 
   void onTap(LatLng position) {
     assert(position != null);
-    widget.onTap(position);
+    if (widget.onTap != null) {
+      widget.onTap(position);
+    }
   }
 }
 

packages/google_maps_flutter/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter
-version: 0.5.11+1
+version: 0.5.12
 
 dependencies:
   flutter: