AssertionError when DEBUG = True

[smetroid]

Hello,

We're trying to build an API using flask-mysql. When flask has DEBUG=True we're getting the error below.

AssertionError
AssertionError: A setup function was called after the first request was handled. This usually indicates a bug in the application where a module was not imported and decorators or other functionality was called too late.
To fix this make sure to import all your view modules, database models and everything related at a central place before the application starts serving requests.

Once we remove the DEBUG flask option the application is able to communicate with the MYSQL database just fine.