fix

front/src/Connexion/ConnectionManager.ts

@@ -178,6 +178,7 @@ class ConnectionManager {
             } catch (e) {
                 console.error(e);
                 localUserStore.setLastRoomUrl(null);
+                this._currentRoom = null;
             }
             if (this._currentRoom != undefined && this._currentRoom.textures != undefined && this._currentRoom.textures.length > 0) {
                 //check if texture was changed

front/src/Phaser/Game/GameScene.ts

@@ -456,6 +456,12 @@ export class GameScene extends DirtyScene {
         //initialise map
         this.Map = this.add.tilemap(this.MapUrlFile);
         const mapDirUrl = this.MapUrlFile.substr(0, this.MapUrlFile.lastIndexOf("/"));
+
+        if (!this.mapFile) {
+            localUserStore.setLastRoomUrl(null);
+            throw new Error("invalid map");
+        }
+
         this.mapFile.tilesets.forEach((tileset: ITiledTileSet) => {
             this.Terrains.push(
                 this.Map.addTilesetImage(