I get this error, if I play around with vehicle mode.
Version: 6.29.4 (SL)

Message: ...nterface/AddOns/NDui/Modules/ActionBar/Bars/Bar4.lua:14: attempt to call global 'InterfaceOptions_UpdateMultiActionBars' (a nil value)
Time: Thu Oct 27 12:53:33 2022
Count: 4
Stack: ...nterface/AddOns/NDui/Modules/ActionBar/Bars/Bar4.lua:14: attempt to call global 'InterfaceOptions_UpdateMultiActionBars' (a nil value)
[string "@Interface/AddOns/NDui/Modules/ActionBar/Bars/Bar4.lua"]:14: in function `func'
[string "@Interface/AddOns/NDui/Init.lua"]:23: in function <Interface/AddOns/NDui/Init.lua:18>

Locals: event = "UNIT_EXITED_VEHICLE"
(*temporary) = nil
(*temporary) = "attempt to call global 'InterfaceOptions_UpdateMultiActionBars' (a nil value)"
InCombatLockdown = defined =[C]:-1
B =

{
AddTooltip = defined @Interface/AddOns/NDui/Core/Functions.lua:514
AuraIcon = defined @Interface/AddOns/NDui/Core/Functions.lua:694
SetGradient = defined @Interface/AddOns/NDui/Core/Functions.lua:537
ReskinDropDown = defined @Interface/AddOns/NDui/Core/Functions.lua:1110
ReskinStepperSlider = defined @Interface/AddOns/NDui/Core/Functions.lua:1375
RestoreBlizzFrame = defined @Interface/AddOns/NDui/Core/Mover.lua:42
GetNPCID = defined @Interface/AddOns/NDui/Core/Functions.lua:95
GetNPCName = defined @Interface/AddOns/NDui/Core/Functions.lua:348
CreateSD = defined @Interface/AddOns/NDui/Core/Functions.lua:575
ScanTip = NDui_ScanTooltip {
}
ReskinFilterReset = defined @Interface/AddOns/NDui/Core/Functions.lua:1224
CopyTable = defined @Interface/AddOns/NDui/Core/Functions.lua:101
UpdateBlizzFrame = defined @Interface/AddOns/NDui/Core/Mover.lua:34
CreateBD = defined @Interface/AddOns/NDui/Core/Functions.lua:607
ReskinNavBar = defined @Interface/AddOns/NDui/Core/Functions.lua:1251
RestoreMF = defined @Interface/AddOns/NDui/Core/Mover.lua:26
InspectItemInfo = defined @Interface/AddOns/NDui/Core/Functions.lua:223
ReskinMinMax = defined @Interface/AddOns/NDui/Core/Functions.lua:1447
PixelIcon = defined @Interface/AddOns/NDui/Core/Functions.lua:672
CreateColorSwatch = defined @Interface/AddOns/NDui/Core/Functions.lua:1814
RegisterModule = defined @Interface/AddOns/NDui/Init.lua:62
CreateAndUpdateBarTicks = defined @Interface/AddOns/NDui/Core/Functions.lua:825
CreateGear = defined @Interface/AddOns/NDui/Core/Functions.lua:702
Reskin = defined @Interface/AddOns/NDui/Core/Functions.lua:904
ResetTabAnchor = defined @Interface/AddOns/NDui/Core/Functions.lua:978
UnitColor = defined @Interface/AddOns/NDui/Core/Functions.lua:152
Dummy = defined @Interface/AddOns/NDui/Core/Functions.lua:374
ReskinClose = defined @Interface/AddOns/NDui/Core/Functions.lua:1144
ClassIconTexCoord = defined @Interface/AddOns/NDui/Core/Functions.lua:798
SetCurrenciesHook = defined @Interface/AddOns/NDui/Modules/Skins/Blizzard/Blizzard_RuneforgeUI.lua:20
ReskinIconSelector = defined @Interface/AddOns/NDui/Modules/Skins/Blizzard/FrameXML/CharacterFrame.lua:4
ReskinGarrisonTooltip = defined @Interface/AddOns/NDui/Modules/Skins/Blizzard/FrameXML/GarrisonFollowerTooltip.lua:13
ReskinSlider = defined @Interface/AddOns/NDui/Core/Functions.lua:1334
ReplaceWidgetBarTexture = defined @Interface/AddOns/NDui/Modules/Skins/Blizzard/FrameXML/UIWidgets.lua:18
ReplaceIconString = defined @Interface/AddOns/NDui/Modules/Skins/Blizzard/Blizzard_AnimaDiversionUI.lua:4
HideTooltip = defined @Interface/AddOns/NDui/Core/Functions.lua:490
IsBase64 = defined @Interface/AddOns/NDui/Libs/LibBase64.lua:143
SetFontSize = defined @Interface/AddOns/NDui/Core/Functions.lua:466
RegisterEvent = defined @Interface/AddOns/NDui/Init.lua:28

Hey Siweia,

Version .5 fixed the problem somehow.
It is still not perfect, because now, I have a yellow backdrop on not used buttons.
See attached screenshot.

And there you can see parts of the strange moved petbar.