Connection lost in pymysql

[artyomLisovskij]

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1811, in full_dispatch_request
    rv = self.preprocess_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2087, in preprocess_request
    rv = func()
  File "/usr/local/lib/python3.6/dist-packages/flask_principal.py", line 477, in _on_before_request
    identity = loader()
  File "/usr/local/lib/python3.6/dist-packages/flask_security/core.py", line 245, in _identity_loader
    if not isinstance(current_user._get_current_object(), AnonymousUserMixin):
  File "/usr/local/lib/python3.6/dist-packages/werkzeug/local.py", line 306, in _get_current_object
    return self.__local()
  File "/usr/local/lib/python3.6/dist-packages/flask_login/utils.py", line 26, in <lambda>
    current_user = LocalProxy(lambda: _get_user())
  File "/usr/local/lib/python3.6/dist-packages/flask_login/utils.py", line 335, in _get_user
    current_app.login_manager._load_user()
  File "/usr/local/lib/python3.6/dist-packages/flask_login/login_manager.py", line 359, in _load_user
    return self.reload_user()
  File "/usr/local/lib/python3.6/dist-packages/flask_login/login_manager.py", line 321, in reload_user
    user = self.user_callback(user_id)
  File "/usr/local/lib/python3.6/dist-packages/flask_security/core.py", line 221, in _user_loader
    return _security.datastore.find_user(id=user_id)
  File "/usr/local/lib/python3.6/dist-packages/flask_security/datastore.py", line 366, in find_user
    return self.user_model.filter(**kwargs).get()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 5911, in get
    return clone.execute(database)[0]
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 1587, in inner
    return method(self, database, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 1658, in execute
    return self._execute(database)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 1809, in _execute
    cursor = database.execute(self)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2666, in execute
    return self.execute_sql(sql, params, commit=commit)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2660, in execute_sql
    self.commit()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2451, in __exit__
    reraise(new_type, new_type(*exc_args), traceback)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 178, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2653, in execute_sql
    cursor.execute(sql, params or ())
  File "/usr/local/lib/python3.6/dist-packages/pymysql/cursors.py", line 170, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.6/dist-packages/pymysql/cursors.py", line 328, in _query
    conn.query(q)
  File "/usr/local/lib/python3.6/dist-packages/pymysql/connections.py", line 515, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/usr/local/lib/python3.6/dist-packages/pymysql/connections.py", line 745, in _execute_command
    raise err.InterfaceError("(0, '')")
peewee.InterfaceError: (0, '')

I understand that this isn't peewee problem(it's pymysql, okay), but how can i prevent this error when i use flask+peewee+mysql?