Hi List, for some reason the scheduler.module recorded the time for publish and unpublish in local time of the user with an additional timezone column for translation to utc or whatever. Some time ago I changed it, so that it would store the times in utc and removed the timezone column. This was done for both 5.x and 6.x. Now when upgrading from a current 5.x release to 6.x scheduler_update_6100() gets called and tries to adjust already stored times by their respective timezone values and then removes the timezone column. function scheduler_update_6100() { $ret[] = update_sql("UPDATE {scheduler} SET publish_on=publish_on-timezone WHERE publish_on<>0"); $ret[] = update_sql("UPDATE {scheduler} SET unpublish_on=unpublish_on-timezone WHERE unpublish_on<>0"); $ret[] = update_sql("ALTER TABLE {scheduler} DROP COLUMN timezone"); return $ret; } Since the timezone column does not exists in current 5.x releases the update fails. To avoid it I would check for the existence of the timezone column. But: How? Regards, Eric