WowAce

With the latest update (1.45.5), I have started seeing errors like this:

Date: 2019-10-15 16:32:41
ID: 2
Error occured in: Global
Count: 1
Message: ..\AddOns\ElvUI_CodeNameBlaze\core\init.lua line 72:
attempt to call method 'ToggleConfig' (a nil value)
Debug:
(tail call): ?
ElvUI_CodeNameBlaze\core\init.lua:72:
ElvUI_CodeNameBlaze\core\init.lua:72
[C]: ?
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:51:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:49
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:875:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:696
[C]: ?
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:72:
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:70
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:290: Fire()
...Libs\Ace3\AceGUI-3.0\widgets\AceGUIWidget-Button.lua:22:
...Libs\Ace3\AceGUI-3.0\widgets\AceGUIWidget-Button.lua:19

This mainly seems to happen in loot /harvest cases, but has randomly popped up with various AddOns designed to show more data than the WoWUI default or "rollups" such as Project Azilroka.

Date: 2019-10-15 12:38:52
ID: 2
Error occured in: Global
Count: 1
Message: ...ace\AddOns\ProjectAzilroka\Modules\MovableFrames.lua line 317:
attempt to index field '?' (a nil value)
Debug:
(tail call): ?
...ace\AddOns\ProjectAzilroka\Modules\MovableFrames.lua:317: member()
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:221:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:169
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1245:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1154
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1181:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1154
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1734: FeedGroup()
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1659:
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1643
[C]: ?
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:72:
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:70
...ce\AddOns\GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua:290: Fire()
...ce3\AceGUI-3.0\widgets\AceGUIContainer-TreeGroup.lua:515: SetSelected()
...ce3\AceGUI-3.0\widgets\AceGUIContainer-TreeGroup.lua:191:
...ce3\AceGUI-3.0\widgets\AceGUIContainer-TreeGroup.lua:187

The common factor are the GatherMate2\Libs\AceGUI-3.0\AceGUI-3.0.lua sections.

Removing GM2 (which I don't want to do long-term) resolves the issue...