Critical Error Bug

I have a problem i get everytime i play killingfloor after a few min or hours



here is the error message :



Build UT2004_Build_[2004-11-11_10.48]



OS: Windows NT 6.1 (Build: 7600)

CPU: AuthenticAMD Unknown processor @ 2907 MHz with 4095MB RAM

Video: ATI Radeon HD 5800 Series (1172)



Assertion failed: inst->KPhysRootIndex != INDEX_NONE && inst->KPhysLastIndex != INDEX_NONE [File:.\KSkeletal.cpp] [Line: 595]



History: KInitSkeletonKarma <- KInitActorKarma <- AActor::setPhysics <- UObject::ProcessEvent <- (SRHumanPawn KF-UltrasHell.SRHumanPawn, Function KFmod.KFPawn.PlayDying) <- AActor::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=3) <- TickLevel <- UGameEngine::Tick <- Level Ultra's Hell <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 726F6F6C 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free



This bug is really annoying and i tried most things i already reinstalled the game cleared local game files everything but nothing worked.

Would be great if anyone knows a solution to this i already tried searching through the internet but i didnt find anything helpful