WowAce

I was in combat. I reloaded UI and then got this error:

80x ...aceSkada\lib\LibWindow-1.1\LibWindow-1.1-8.lua:128: attempt to perform arithmetic on a nil value
...aceSkada\lib\LibWindow-1.1\LibWindow-1.1-8.lua:128: in function `SavePosition'
Skada\BarDisplay.lua:618: in function <Skada\BarDisplay.lua:535>
[C]: in function `ApplySettings'
AddOnSkins\Embed\Skada-1.7.2.lua:45: in function `EmbedSkadaWindow'
AddOnSkins\Embed\Skada-1.7.2.lua:68: in function `Embed_Skada'
AddOnSkins\Skins\Skada-1.7.2.lua:74: in function <AddOnSkins\Skins\Skada.lua:72>
[C]: in function `UpdateDisplay'
Skada\Skada-1.7.2.lua:1567: in function `StartCombat'
Skada\Skada-1.7.2.lua:1481: in function `?'
Skada\Skada-1.7.2.lua:42: in function <Skada\Skada.lua:41>

Locals:
InCombatSkipped