Temporarily empty Config page after update

[olafgrabienski]

After an update to release v1.x-1.1.1, I visited the configuration page admin/config/content/tocbot. It was empty, and I found two related messages in the DBlog:

• Notice: Undefined index: tocbot_config_form in backdrop_retrieve_form() (line 820 of (...)/core/includes/form.inc).
• Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'tocbot_config_form' not found or invalid function name in backdrop_retrieve_form() (line 864 of (...)/core/includes/form.inc).

Solution: I cleared all caches using the Admin menu link, and the page showed the configuration form as expected.

[olafgrabienski]

Not sure if and how to fix the issue otherwise.