That sounds like really bad luck. Are you quitting via the pause and flee option?
No, because I don't know when does the drop happen (is it at the beginning of the dying animation, or the end?)
edit: finally get a whip at 10th tries, so it is nearly the end and would be difficult to time if it doesn't drop anything)
 
	 
				 
 
		 
 
		 
 
		 
		 
	 
 
		