We ran into this error in T315510. Very rare, 12 hits in last 90 days: https://logstash.wikimedia.org/goto/9a4b05deeaa6318abc1b991abf3fb175
Affects a single page on frwiki: https://fr.wikipedia.org/wiki/Wikipédia:Oracle/semaine_9_2006 where some jokester wrote a comment with the timestamp "0 janvier 0000 à 00:00 (CET)" ;)