Use Flask-Hashids package

app/events/socketio.py

@@ -12,7 +12,7 @@ from ..models import User
 @socketio.on('users.user.get')
 @socketio_login_required
 def users_user_get(user_hashid):
-    user_id = hashids.decode(user_hashid)[0]
+    user_id = hashids.decode(user_hashid)
     user = User.query.get(user_id)
     if user is None:
         response = {'code': 404, 'msg': 'Not found'}