ZDoom

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"give bfg9000" in that map freezes the game. I can reproduce the error.
c_dispatch.cpp
	if ( (com = FindNameInHashTable (Commands, beg, len)) )
c_cmds.cpp
	CCMD (give)
	DEM_GIVECHEAT
d_net.cpp
	case DEM_GIVECHEAT
m_cheat.cpp
	void cht_Give (player_t *player, const char *name, int amount)
	VMCall(func, params, 3, nullptr, 0);
	IFVIRTUALPTR leads me to script functions
	the function "CheatGive" is called
so that might be in... player_cheat.txt
	GiveInventory...
	setting breakpoints on all giveInventory-s I can find, I land in:
p_mobj.cpp/bool AActor::GiveInventory(PClassActor *type, int amount, bool givecheat)
	item = static_cast<AInventory *>(Spawn (type, Pos(), NO_REPLACE));
	if (item == NULL) return false; => item is not null in our case, so the spawning worked
	...
	if (!item->CallTryPickup (this)) => ### this freezes ###
		bool AInventory::CallTryPickup(AActor *toucher, AActor **toucher_return)
		if (func == nullptr) PClass::FindFunction(&func, NAME_Inventory, NAME_CallTryPickup);
		VMCall(func, params, 2, ret, 2); => back to the scripting layer
		we probably land in:
inventory.txt/bool, Actor CallTryPickup(Actor toucher)
	what about CanPickup? => determins if the player is allowed to pick it up
	what about TryPickup?
	hm... I can't figure it out further from here.
When I stop the frozen program in the debugger, I end up with a program stack that doesn't allow me to find my way back into the known source code...
I don't know how to push changed files from the zscript dir into the program -- The scripting part is so involved here it would help a lot to comment out a things a bit to pin down the fault location further.
Oh wait, I've continued and stopped the debugger a few more times and landed somewhere!
p_mobj.cpp/AActor *AActor::StaticSpawn (PClassActor *type, const DVector3 &pos, replace_t allowreplacement, bool SpawningMapThing)
	=> P_FindFloorCeilingz
	while ((mit.Next(&cres)))
	{
		PIT_FindFloorCeiling(mit, cres, mit.Box(), tmf, flags|cres.portalflags);
	}
	This thing loops infinitely!