In the condition of 2 players from the same permission group opening a npc GUI together,GUI do not disappear from one's screen when the other one put the NPC in the pack.

So problem is, a NPC can creat numerous of NPC and they are totally the same as the original one, it causes a lot of trouble in my service, coupons are copied a lot.It makes me a headache.

Could you please solve this problem?