When it casts Insanity and creates enemy copies of the players, the game client crashes. The crash log points at line 41 in TooltipScanning.lua.

This is something Blizzard needs to fix since addons shouldn't be capable of crashing the game client.

@ascott18 the issue is tt:ClearLines() in Categories\TooltipScanning.lua. We've tried nil-checking tt but that didn't do it. If you've got any thoughts, I'm all ears. I'm inclined to bypass ClearLines in Wrath Classic only until Blizzard patches the crash or something, but I don't know what the actual problem at the game client level is.

Yuck. Yeah, the only idea I have is to not call the function. Maybe only if in combat, and only for Wrath Classic?