504 issue

Hi,

We get a 504 gateway timeout error when trying to access the ‘blocked user list’.

I read on the forum that others have the same issue.

How can we solve this?

When enabling debugging, we only get the following warning:

[01-Oct-2020 12:53:54 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘redirect_to_specific_page’ not found or invalid function name in /wp-includes/class-wp-hook.php on line 287