Describe the bug
A clear and concise description of what the bug is.

To Reproduce

Simply logging in gives me this error

• Addon Version: 2.09
• ElvUI Version 12.11
• WoW Build 9.0.2 (36639)

Error from BugSack:

17x ...dOns\ElvUI_WindTools\Modules\Skins\Blizzard\Help.lua:12: attempt to index field 'Header' (a nil value)
[string "@ElvUI_WindTools\Modules\Skins\Blizzard\Help.lua"]:12: in function <...dOns\ElvUI_WindTools\Modules\Skins\Blizzard\Help.lua:6>
[string "=[C]"]: ?
[string "@ElvUI_WindTools\Modules\Skins\Core.lua"]:369: in function <ElvUI_WindTools\Modules\Skins\Core.lua:363>
[string "=[C]"]: ?
[string "@ElvUI_WindTools\Core\Core.lua"]:59: in function InitializeModules' [string "@ElvUI_WindTools\Initialize.lua"]:47: in function ?'
[string "@ElvUI\Libraries\LibElvUIPlugin-1.0\LibElvUIPlugin-1.0-36.lua"]:303: in function <...\Libraries\LibElvUIPlugin-1.0\LibElvUIPlugin-1.0.lua:299>
[string "=[C]"]: in function Initialize' [string "@ElvUI\init.lua"]:156: in function <ElvUI\init.lua:155> [string "=[C]"]: ? [string "@Details\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:70: in function <...ceDetails\Libs\AceAddon-3.0\AceAddon-3.0.lua:65> [string "@Details\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:527: in function EnableAddon'
[string "@details\Libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:630: in function <...ceDetails\Libs\AceAddon-3.0\AceAddon-3.0.lua:615>

I think the bug is only on sl beta, because there is no help frame in beta.
Do you have same issue in retail?

I added a confirmation before skinning in 2.10-beta-5, you can download the dev version from curse or github publish.

I think the bug is only on sl beta, because there is no help frame in beta.
Do you have same issue in retail?

Correct. I'm using the same ElvUI and Windtools versions in both retail and beta. I am only getting the error in beta.

Thank you!