Since a few weeks, we're getting the below error when trying to change certain settings:

There are settings that we were able to change before, but are now longer able to change due to this error.
We've tried to apply the solutions found in the topics below, but these did nothing to resolve this issue:
viewtopic.php?t=38341
viewtopic.php?t=38780

@Roy - This started happening after our scheduled call, where we changed a configuration setting with logging certain events, I just can't remember the specific setting.