In 3481e3b2e0af @dbarratt modified SpecialBlock::getSuggestedDurations to return an option named 'other' at the end of all other block duration suggestions. While this works well for MW core, he accidentally broke another dependency in AbuseFilter in includes/views/AbuseFilterViewEdit.php
I will make a patch shortly to add an optional variable to getSuggestedDurations to suppress the 'other' option whenever it is not desired.