Looting causing LUA error with new update

[6f324e31]

I am looting "Iron Horde Weapons" from the "Preparing for Battle" quest for level 90. When I attempt to loot a pile of weapons I get this error message...

Message: ...rface\AddOns\ZygorGuidesViewer\GoldUI\Appraiser 2.lua:658: attempt to perform arithmetic on local 'timestamp' (a nil value)
Time: 03/12/15 15:59:58
Count: 4
Stack: ...rface\AddOns\ZygorGuidesViewer\GoldUI\Appraiser 2.lua:658: in function `OldColor'
...rface\AddOns\ZygorGuidesViewer\GoldUI\Appraiser 2.lua:717: in function <...rface\AddOns\ZygorGuidesViewer\GoldUI\Appraise r2.lua:656>
[C]: ?
[C]: ?
[C]: in function `SetLootItem'
Interface\FrameXML\LootFrame.lua:365: in function `LootItem_OnEnter'
[string "*:OnEnter"]:1: in function <[string "*:OnEnter"]:1>

Locals: timestamp = nil
red = 7200
yellow = 600
(*temporary) = 1426201198
(*temporary) = 1426201198
(*temporary) = "attempt to perform arithmetic on local 'timestamp' (a nil value)"

For some reason it doesn't happen on every single loot attempt but it seems to happen at least 50% of the time. Pretty annoying.

[Zygor Admin]

Just sent out a hotfix for this error. Please update your guides.