LUA error occurs ingame:

2x MultiBarLeft:SetScale(): Scale must be > 0
[string "=[C]"]: in function SetScaleBase' [string "@Interface/FrameXML/EditModeSystemTemplates.lua"]:114: in function SetScale'
[string "@Interface/FrameXML/EditModeManager.lua"]:612: in function UpdateRightActionBarPositions' [string "@Interface/FrameXML/EditModeManager.lua"]:582: in function UpdateActionBarLayout'
[string "@Interface/FrameXML/ActionBar.lua"]:342: in function UpdateVisibility' [string "@Interface/FrameXML/ActionBar.lua"]:309: in function HideOverride'
[string "@Interface/FrameXML/ActionBar.lua"]:294: in function SetShown' [string "@Interface/FrameXML/MultiActionBars.lua"]:67: in function <Interface/FrameXML/MultiActionBars.lua:62> [string "@Interface/FrameXML/MultiActionBars.lua"]:76: in function MultiActionBar_Update'
[string "@Interface/FrameXML/ActionBarController.lua"]:218: in function ValidateActionBarTransition' [string "@Interface/FrameXML/ActionBarController.lua"]:162: in function <Interface/FrameXML/ActionBarController.lua:130> [string "=[C]"]: in function ActionBarController_UpdateAll'
[string "@Interface/FrameXML/ActionBarController.lua"]:66: in function <Interface/FrameXML/ActionBarController.lua:55>

Locals:
(*temporary) = MultiBarLeft {
0 =
buttonPadding = 2
GetShowAllButtons = defined @Interface/FrameXML/ActionBar.lua:180
UpdateSystemSettingAlwaysShowButtons = defined @Interface/FrameXML/EditModeSystemTemplates.lua:923
UpdateMagnetismRegistration = defined @Interface/FrameXML/EditModeSystemTemplates.lua:654
GetSnapOffsets = defined @Interface/FrameXML/EditModeSystemTemplates.lua:532
UpdateFrameStrata = defined @Interface/FrameXML/ActionBar.lua:184
UpdateButtonArt = defined @Interface/FrameXML/EditModeSystemTemplates.lua:816
IsFrameAnchoredToMe = defined @Interface/FrameXML/EditModeSystemTemplates.lua:617
downKeys =

{
}
buttonTemplate = "MultiBar4ButtonTemplate"
ShowBase = defined =[C]:-1
IsShown = defined @Interface/FrameXML/ActionBar.lua:278
GetSelectionOffset = defined @Interface/FrameXML/EditModeSystemTemplates.lua:463
ResetToDefaultPosition = defined @Interface/FrameXML/EditModeSystemTemplates.lua:233
RefreshButtonArt = defined @Interface/FrameXML/EditModeSystemTemplates.lua:809
GetScaledSelectionSides = defined @Interface/FrameXML/EditModeSystemTemplates.lua:455
SelectSystem = defined @Interface/FrameXML/EditModeSystemTemplates.lua:686
buttonArtDirty = false
GetFrameMagneticEligibility = defined @Interface/FrameXML/EditModeSystemTemplates.lua:637
AddLayoutChildren = defined @Interface/SharedXML/LayoutFrame.lua:55
IsBelowFrame = defined @Interface/FrameXML/EditModeSystemTemplates.lua:422
UpdateSystemSettingIconSize = defined @Interface/FrameXML/EditModeSystemTemplates.lua:861
SetScaleBase = defined =[C]:-1
HasActiveChanges = defined @Interface/FrameXML/EditModeSystemTemplates.lua:344
GetScaledCenter = defined @Interface/FrameXML/EditModeSystemTemplates.lua:448
UpdateSystemSettingHideBarArt = defined @Interface/FrameXML/EditModeSystemTemplates.lua:890
UpdateDisplayInfoOptions = defined @Interface/FrameXML/EditModeSystemTemplates.lua:379
GetSystemName = defined @Interface/FrameXML/EditModeSystemTemplates.lua:747
ProcessMovementKey = defined @Interface/FrameXML/EditModeSystemTemplates.lua:39
GetSettingValueBool = defined @Interface/FrameXML/EditModeSystemTemplates.lua:359
OnKeyUp = defined @Interface/FrameXML/EditModeSystemTemplates.lua:89
IsLayoutFrame = defined @Interface/SharedXML/LayoutFrame.lua:36
DoesSettingValueEqual = defined @Interface/FrameXML/EditModeSystemTemplates.lua:363
MarkDirty = defined @Interface/SharedXML/LayoutFrame.lua:99
ShouldResetSettingsDialogAnchors = defined @Interface/FrameXML/EditModeSystemTemplates.lua:172
dirtySettings = {
}
UpdateGridLayout = defined @Interface/FrameXML/EditModeSystemTemplates.lua:795
IsToTheLeftOfFrame = defined @Interface/FrameXML/EditModeSystemTemplates.lua:404
GetSettingsDialogAnchor = defined @Interface/FrameXML/EditModeSystemTemplates.lua:388
hasActiveChanges = false
OnSystemLoad = defined @Interface/FrameXML/EditModeSystemTemplates.lua:3
ClearFrameSnap = defined @Interface/FrameXML/EditModeSystemTemplates.lua:576
GetCombinedCenterOffset = defined @Interface/FrameXML/EditModeSystemTemplates.lua:519
SetupSettingsDialogAnchor = defined @Interface/FrameXML/EditModeSystemTemplates.lua:332
IsShownOverride = defined @Interface/FrameXML/ActionBar.lua:278
dirty = false
SetPointBase = defined =[C]:-1
UpdateSystem = defined @Interface/FrameXML/EditModeSystemTemplates.lua:758
UpdateShownButtons = defined @Interface/FrameXML/ActionBar.lua:188
UpdateDirtySettings = defined @Interface/FrameXML/EditModeSystemTemplates.lua:193
BreakSnappedFrames = defined @Interface/FrameXML/EditModeSystemTemplates.lua:559
HideOverride = <func