- added an inventory check to A_KeenDie so that it still works if a patch repurposes a pickup item that may end up in the player's inventory.

wadsrc/static/zscript/doom/keen.txt

@@ -69,11 +69,16 @@ extend class Actor
 		while (mo = Actor(it.Next(true)))
 		{
 			if (mo.health > 0 && mo != self)
+			{
+				// Added check for Dehacked and repurposed inventory items.
+				let inv = Inventory(mo);
+				if (inv == null || inv.Owner == null)
 				{
 					// other Keen not dead
 					return;
 				}
 			}
+		}
 		Door_Open(doortag, 16);
 	}
 }