Are there any hosts out there who haven't gotten this runtime error? Not "Oh I hosted for an hour and didn't get it", i'm talking about people who host servers that are frequently populated with more than 15 players. If so, could you upload some basic info like maybe an add-ons list? Badspot seems to think it's caused by an add-on, so any proof for/against that would be nice.
In contrast, is there anyone who hosts a server that has gotten this error with only default add-ons?