another bug in Sources/Subs-CustomBBCodes.php that caused me 12 errors at a time because $data is an array.
I disabled the code as i didn't really see the need for it but you may want it and be able to come up with a better solution of course.
I needed to clear the file cache (Admin > Maintenance/Forum Maintenance > Routine > Empty the file cache) after the patch.
locate:
if (!empty($row['accept_urls']))
$row['vfunc'][] = 'CustomBBCodes_URL';
change to:
// disabled bug fix if (!empty($row['accept_urls']))
// disabled bug fix $row['vfunc'][] = 'CustomBBCodes_URL';
NOTE: the GitHub repo version is untested but should be identical to this