Lua NPC: onCreatureSay, onCreatureDisappear: (luaDoCreatureSay) Creature not found

[okurde]

Hello, I have 2 problems with NPC. Sometimes there appear error in logs:

[Error - NpcScript Interface]
In a timer event called from:
data/npc/scripts/Captain Marko.lua:onCreatureSay
Description:
(luaDoCreatureSay) Creature not found

but I have no idea why.


And the second problem is involved with restarting server, moment before closing server there are a lot of errors:

[Error - NpcScript Interface]
In a timer event called from:
data/npc/scripts/Xodet.lua:onCreatureDisappear
Description:
(luaDoCreatureSay) Creature not found

Does anyone have any idea why it occurs and how to fix it?

 

[Limos]

Which server do you use, do you have this with all NPCs or only a few?