Update app.py

app.py

@@ -887,7 +887,7 @@ async def exe(websocket,connected,key):
             else:
                 # First player starts a new game.
                 pass
-        except RuntimeError as exc:
+        except Exception as exc:
             # Send an "error" event if the move was illegal.
             await error(websocket, str(exc))
             continue