What steps will reproduce the problem?

1. Heroic Xavius midway through the first phase

What version of BigWigs are you using?

v18

Do you have an error log of what happened?

Message: Interface\AddOns\BigWigs_Plugins\Bars.lua:1484: attempt to compare nil with number
Time: 10/13/16 22:07:41
Count: 3
Stack: [C]: ?
Interface\AddOns\BigWigs_Plugins\Bars.lua:1484: in function ?' Interface\AddOns\BigWigs\Loader.lua:652: in functionSendMessage'
Interface\AddOns\BigWigs_Core\BossPrototype.lua:1492: in function CDBar' Interface\AddOns\BigWigs_Nightmare\Xavius.lua:246: in function?'
Interface\AddOns\BigWigs_Core\BossPrototype.lua:354: in function <Interface\AddOns\BigWigs_Core\BossPrototype.lua:339>

Locals:

Please provide any additional information below. (example: localization of your client if not enUS or enGB)

Spams my interface with a series of these errors. Somewhere around 16-30ish according to error filter. Not sure why this is happening