It looks like maybe this is also blocking my fix of the watchlist issue:
Aug 18 22:45:51 mw1017: #012Catchable fatal error: Argument 1 passed to Flow\Formatter\RevisionFormatter::formatApi() must be an instance of Flow\Formatter\FormatterRow, bool given in /srv/mediawiki/php-1.26wmf19/extensions/Flow/includes/Formatter/RevisionFormatter.php on line 331 Aug 18 23:12:11 mw1133: #012Catchable fatal error: Argument 1 passed to Flow\Formatter\RevisionFormatter::formatApi() must be an instance of Flow\Formatter\FormatterRow, bool given in /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/RevisionFormatter.php on line 331 Aug 18 23:17:00 mw1221: #012Catchable fatal error: Argument 1 passed to Flow\Formatter\RevisionFormatter::formatApi() must be an instance of Flow\Formatter\FormatterRow, bool given in /srv/mediawiki/php-1.26wmf19/extensions/Flow/includes/Formatter/RevisionFormatter.php on line 331
From fatal.log:
2015-08-18 23:12:11 mw1133 enwiki fatal ERROR: [bc3b2ebf] /w/api.php ErrorException from line 331 of /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/RevisionFormatter.php: PHP Error: Argument 1 passed to Flow\Formatter\RevisionFormatter::formatApi() must be an instance of Flow\Formatter\FormatterRow, bool given {"exception":"[Exception ErrorException] (/srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/RevisionFormatter.php:331) PHP Error: Argument 1 passed to Flow\\Formatter\\RevisionFormatter::formatApi() must be an instance of Flow\\Formatter\\FormatterRow, bool given [stacktrace] #0 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/RevisionFormatter.php(331): MWExceptionHandler::handleError(integer, string, string, integer) #1 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/IRCLineUrlFormatter.php(70): Flow\\Formatter\\RevisionFormatter->formatApi(boolean, RequestContext, string) #2 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Formatter/IRCLineUrlFormatter.php(48): Flow\\Formatter\\IRCLineUrlFormatter->serializeRcRevision(RecentChange, RequestContext) #3 /srv/mediawiki/php-1.26wmf18/includes/changes/RecentChange.php(384): Flow\\Formatter\\IRCLineUrlFormatter->getLine(array, RecentChange, NULL) #4 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Listener/RecentChangesListener.php(127): RecentChange->notifyRCFeeds(array) #5 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Listener/DeferredInsertLifecycleHandler.php(36): Flow\\Data\\Listener\\RecentChangesListener->onAfterInsert(Flow\\Model\\PostRevision, array, array) #6 /srv/mediawiki/php-1.26wmf18/includes/deferred/CallableUpdate.php(27): Closure$Flow\\Data\\Listener\\DeferredInsertLifecycleHandler::onAfterInsert() #7 /srv/mediawiki/php-1.26wmf18/includes/deferred/DeferredUpdates.php(119): MWCallableUpdate->doUpdate() #8 /srv/mediawiki/php-1.26wmf18/includes/MediaWiki.php(697): DeferredUpdates::doUpdates(string) #9 /srv/mediawiki/php-1.26wmf18/includes/MediaWiki.php(522): MediaWiki->restInPeace() #10 [internal function]: Closure$MediaWiki::doPostOutputShutdown() #11 {main} "}