Crashing when joining a lobby from spectating

[pash1k]

Played with shadowstew, he has Windows 8.1, I have Windows 7. I created a private lobby for 2 people, invited him, he was spectating at the time and joined my lobby. He got an 89 on his screen that stayed through lobby, character select and the first round. During our match, just during neutral we both got a Visual Studio C++ runtime error. Game crashed for us both. We tried reproducing the error, could get the 89 on the screen (went away after first round concluded) but couldn't get runtime error again.

Screenshots: 1 2 3

 

[Datagram]

Ah, so that's that you and Stew were doing.
You found a way to reproduce the 89 bug? Nice.