Hello all! I have not yet started the 1.33.0-wmf.18 train; however, at the end of last week, I noticed some errors that (AFAICT) are regressions in 1.33.0-wmf.17. There were two new errors that started showing up in 1.33.0-wmf.17: 1. ErrorException from includes/HeaderCallback.php: PHP Notice: Undefined offset: 1[0] 2. includes/specials/pagers/ActiveUsersPager.php: PHP Notice: Undefined index: dir[1] Neither of these errors were happening at a high enough rate, or with enough of a user impact to trigger a rollback of 1.33.0-wmf.17; however, I added them as blockers for wmf.18 in the hopes that we could address regressions caused from wmf.17 before rolling out wmf.18. If folks could take a look at these tasks and help me resolve these regressions before we start rollout of a new version that'd be great! Thanks in advance for your help and attention! -- Tyler [0]. <https://phabricator.wikimedia.org/T216086> [1]. <https://phabricator.wikimedia.org/T216200>