I have been testing this problem several times and here is the result:

In Citadel level 3 there is a large trapped room to the South side of the map. The room has several traps and a lever in the NorthEast corner of the room.

If you use a Summoning doll to trigger the traps it is an instant Crash-To-Desktop. But if your DK or your Hero triggers the traps, there is no problem (except some vitality loss of course).

I tried this problem 3 times with a Summoning Doll, and 3 times without using the Summoning Doll.