thiemowmde added a comment.
This is actually the exact same root cause as in T259745 <https://phabricator.wikimedia.org/T259745>: The language fallback chain in question is empty, and calling `$languageCode = $languageCodes[0]` on an empty array results in the language code being null. https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/608628 is indeed what caused this, specifically https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/608628/13/lib/includes/TermLanguageFallbackChain.php. I created T259779 <https://phabricator.wikimedia.org/T259779> to keep track of the common root cause. TASK DETAIL https://phabricator.wikimedia.org/T259744 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: thiemowmde Cc: thiemowmde, Agusbou2015, toan, Ladsgroup, Addshore, Pablo-WMDE, Michael, Catrope, Aklapper, brennen, CBogen, Akuckartz, darthmon_wmde, Nandana, Lahi, Gq86, Ramsey-WMF, GoranSMilovanovic, QZanden, LawExplorer, SundanceRaphael, Poyekhali, _jensen, rosalieper, Taiwania_Justo, Scott_WUaS, Jonas, Ixocactus, Wong128hk, alex-mashin, Wikidata-bugs, aude, El_Grafo, Dinoguy1000, jayvdb, MrStradivarius, Lydia_Pintscher, Anomie, Jdforrester-WMF, Jackmcbarn, Steinsplitter, Mbch331, Rxy, Jay8g, Krenair, Keegan
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