quick fix?

front/src/Phaser/Game/GameScene.ts

@@ -429,6 +429,19 @@ export class GameScene extends DirtyScene {
 
     //hook create scene
     create(): void {
+        if (!this.mapFile) {
+            if (this.roomUrl == localUserStore.getLastRoomUrl()) {
+                localUserStore.setLastRoomUrl(null);
+            }
+            
+            //display an error scene
+            this.scene.start(ErrorSceneName, {
+                title: "Network error",
+                subTitle: "An error occurred while loading resource:",
+                message: this.originalMapUrl,
+            });
+        }
+
         this.preloading = false;
         this.trackDirtyAnims();