Bug sous Ut2k3

J'étais en train de jouer à Ut2k3, lorsque j'ai eu ce message d'erreur :
"UT2003 Build UT2003_Build_[2003-04-07_17.42]

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 2361 MHz with 511MB RAM
Video: RADEON 9800 PRO (Omega 2.4.78) (6378)

General protection fault!

History: FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FOctreeNode::ActorZeroExtentLineCheck <- FCollisionOctree::ActorLineCheck <- CheckWithActors <- ULevel::MultiLineCheck <- ULevel::SingleLineCheck <- APawn::CheckForLedges <- APawn: hysWalking <- APawn: erformPhysics <- AActor::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=0) <- TickLevel <- UGameEngine::Tick <- UpdateWorld <- MainLoop"

Quel peut être la cause de ce bug ?
PS : J'ai mis le patch.