Was playing xanaguy's Ultra-Realism+ with 8 Survivors by Raizen.
Crashed once I got into the saferoom at the end of Dark Carnival's first level and got this error

Engine Error
IVP Failed at ..\ivp_intern\ivp_physic_private.cxx 665

All Active scripts when I crashed:
Admin System
Actively Talker
8 Player Modified Talker
Ultra-Realism+
Survivor Ragdolls (Global)
Realistic Ragdolls
Dynamic Light
Left 4 Bots
Left 4 Lib
VOX vocalizer
Competitive-Bots+ : Infected - Modular Package

Anyone know what this means?