Zombie Event Error :) REP

[Teddy]

I added http://otland.net/f82/zombie-event-new-version-bug-free-updated-128664/ to my server but when someone die(touch by a zombie) the server freeze and i get this error.

[12/11/2012 12:12:36] [Error - CreatureScript Interface] 
[12/11/2012 12:12:36] data/creaturescripts/scripts/zombie/onthink.lua:onThink
[12/11/2012 12:12:36] Description: 
[12/11/2012 12:12:37] (luaGetCreatureTarget) Creature not found

[12/11/2012 12:12:38] [Error - CreatureScript Interface] 
[12/11/2012 12:12:38] data/creaturescripts/scripts/zombie/onthink.lua:onThink
[12/11/2012 12:12:39] Description: 
[12/11/2012 12:12:39] (luaDoRemoveCreature) Creature not found

after 2-3 sec the server are normal.

how do i fix that ?

Rep++!!