OldUnreal (Engine)

I play dm in u1 with UTWeapons mutator (by dots) and sometimes, the game crashed with some "pickup.touch" error in the window opened after the crash:

(taken from log)
Critical: appError called:
Critical: TMale1Bot DMSpacenoxx.TMale1Bot0 (Function Engine.Pawn.AddInventory:000B) Assertion failed, line 566
Critical: Windows GetLastError: The operation completed successfully. (0)
Exit: Executing UObject::StaticShutdownAfterError
Exit: UGalaxyAudioSubsystem::ShutdownAfterError
Exit: Executing UWindowsClient::ShutdownAfterError
Log: DirectDraw End Mode
Exit: UD3DRenderDevice::ShutdownAfterError
Critical: FFrame::Serialize
Critical: UObject:: ProcessEvent
Critical: (UT_Eightball DMSpacenoxx.UT_Eightball35, Function Engine.Inventory.Pickup.Touch)
Critical: TouchTo
Critical: AActor::BeginTouch
Critical: ULevel::MoveActor
Critical: APawn::physWalking
Critical: APawn::performPhysics
Critical: AActor::Tick
Critical: TickAllActors
Critical: ULevel::Tick
Critical: (NetMode=0)
Critical: TickLevel
Critical: UGameEngine::Tick
Critical: UpdateWorld
Critical: MainLoop
Exit: appExit
Uninitialized: Name subsystem shut down