Instance with multiple map give map crash with instance_destroy()

[arby89]

• rAthena Hash: 68fccf4

• Client Date: 20160203

• Server Mode: Renewal

• Description of Issue:

  • Result: Instance give map server crash.
    if remove instance_destroy() code, it work fine.
    also, if instance using single map, also work fine, not giving map server crash.
  • Expected Result: All char go to save point.
  • How to Reproduce: I create instance of 3 map, move between map, then use npc with instance_destroy() command.
    In my case, one party member at town, one in instance map.
  • Official Information:

• Modifications that may affect results:

[aleos89]

Duplicate of #3386 and several other issues recently reported.