Community Auth Learning...

It's fine we are only humans we make mistakes.
Is not it this is the purpose of versioning the software to fix, update and upgrade the features.

By the way I think I found a bug.
Yesterday the system community-auth works fine without any error.
But this morning It display this error message.

Code:

A PHP Error was encountered

Severity: Error

Message: Call to a member function delete() on null

Filename: models/Auth_model.php

Line Number: 175

Backtrace:

So how do I fix that?

thanks