added player check for protected hits

api.lua

@@ -1849,7 +1849,7 @@ local mob_punch = function(self, hitter, tflp, tool_capabilities, dir)
 	end
 
 -- is mob protected?
-if self.protected
+if self.protected and hitter:is_player()
 and minetest.is_protected(self.object:getpos(), hitter:get_player_name()) then
 	minetest.chat_send_player(hitter:get_player_name(), "Mob has been protected!")
 	return