Costume System syserr

I have this error in syserr and I can't remove costume...
SYSERR: Jan 10 16:59:28 :: RunState: LUA_ERROR: locale/germany/quest/questlib.lua:1636: attempt to index field `result_value' (a nil value)
SYSERR: Jan 10 16:59:28 :: WriteRunningStateToSyserr: LUA_ERROR: quest costume_system.start click
Help me, please..

look in the questlib in line 1636, there is a false seted value.

return mysql_read.result_value[1] is on line 1636 :-s

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