It might be misreading your "null" as a negative number - epoch time is measured as the number of seconds from 1.1.1970 IIRC, and a lot of time values are stored in the database in epoch time values. I'd check the code but I'M ON VACATION! so maybe Aaron'll get bored later today and tell you.
To show how carefully I wasn't paying attention to this most recent dekamegaclick, the closest user on either side, for maybe the first time since I started logging these was....me! Anyway, big ups to the bingbot for scoring the big number.