WowAce

I'm not sure what causes this error message, its seems random and hard to reproduce but here it is:

[00:15:31] ...terface\AddOns\ag_UnitFrames\modules\auras\auras.lua:718: attempt to index local 'c' (a nil value) [C]: ? ...terface\AddOns\ag_UnitFrames\modules\auras\auras.lua:718: in function `ScanAuras' ...terface\AddOns\ag_UnitFrames\modules\auras\auras.lua:546: in function `UpdateAuras' ...terface\AddOns\ag_UnitFrames\modules\auras\auras.lua:196: in function `?' Interface\AddOns\ag_UnitFrames\ag_UnitFrames.lua:461: in function <Interface\AddOns\ag_UnitFrames\ag_UnitFrames.lua:450>