searching for an invalid date in history leads to fatal
{"id":"WBMmZQpAADsAAOmlPpQAAAAO","type":"TimestampException","file":"/srv/mediawiki/php-1.28.0-wmf.23/includes/libs/time/ConvertibleTimestamp.php","line":213,"message":"ConvertibleTimestamp::getTimestamp: The timestamp cannot be represented in the specified format