Make sure the bug also happen when Details! is the only addon enabled.
Bug is reproducable when only Details Addon is loaded !

Game Version: v9.0.1
Details version: R7933
ElvUI: 12.06 (newest stable)

Describe the bug
If trying to click on the title bar on a fixated details window to scroll it up - nothing happens and LUA error comes up.
If trying 2nd time: same like frist try with the exact same lua error :(

Lua Error
Pastebin.com

EDIT: Bug is also reproducable also when only Details Addon is loaded

@Tercioo I know howto exactly reproduce the LUA error above...
Also reproducable when only Details Addon is loaded:

In details config / Window Body -> If I choose "none" as background texture - LUA error comes up
every other texture -> LUA error is gone

@Tercioo hmpf thats really strange
updating all addons -> error still exists
disabled all addons including moveanything / any skin addons / ElvUI -> error still exists
deleting complete WTF Folder / only changing background texture to "none" -> error still exists

I am at the end of my knowledge - dont know anymore howto fix this :(