Error after adding some tags

[rainbowdesign]

I used the topictags extension from this link for some days now: https://codeload.github.com/mi1eurista/phpbb-ext-topictags/zip/refs/heads/patch339 for my phpbb 3.3.11, i am not really sure what version to use at all since the normal recommended installation throws errors too on white / blacklist.

Now i get this error:
[phpBB Debug] PHP Warning: in file [ROOT]/ext/robertheim/topictags/event/acp_listener.php on line 65: Undefined array key "rh_topictags_enabled"