LUA Error on looting Items from some Timewalk Instances

[fubaWoW]

hi there,

I've got an error today on Timewalk "Court of Stars" with the Item Epaulets of Deceitful Intent while i've traded the item to another player.

LUA Error:

2x BetterWardrobe/Modules/Wardrobe.lua:1477: attempt to index global 'SetsDataProvider' (a nil value)
[string "@BetterWardrobe/Modules/Wardrobe.lua"]:1477: in function `OnEvent'
[string "@BetterWardrobe/Modules/Core.lua"]:1504: in function `?'
[string "@AllTheThings/lib/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:109: in function <...ings/lib/CallbackHandler-1.0/CallbackHandler-1.0.lua:109>
[string "=[C]"]: ?
[string "@AllTheThings/lib/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:19: in function <...ings/lib/CallbackHandler-1.0/CallbackHandler-1.0.lua:15>
[string "@AllTheThings/lib/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:54: in function `Fire'
[string "@ElvUI_Libraries/Core/Ace3/AceEvent-3.0-4/AceEvent-3.0.lua"]:120: in function <...UI_Libraries/Core/Ace3/AceEvent-3.0/AceEvent-3.0.lua:119>

Locals:
self = <table> {
 GoToItem = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1677
 UpdateTabButtons = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1691
 HandleFormChanged = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1488
 ShowItemTrackingHelptipOnShow = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1852
 GetActiveTab = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1363
 RestartSearchTracking = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1819
 ClickTab = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1200
 ClearSearch = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1842
 RefreshCameras = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1769
 UpdateUsableAppearances = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1762
 ReloadTab = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1157
 OnKeyDown = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1601
 SwitchSearchCategory = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1801
 OnUpdate = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1502
 SetContainer = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1170
 GoToSet = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1686
 GetAppearanceNameTextAndColor = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1775
 OnShow = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1533
 OnLoad = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1371
 OnHide = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1577
 UpdateProgressBar = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1795
 CheckTab = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1163
 OnEvent = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1389
 GetAppearanceItemHyperlink = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1784
 GetAppearanceSourceTextAndColor = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1780
 SetSearch = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1833
 SetAppearanceTooltip = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1710
 OpenTransmogLink = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1623
 HideAppearanceTooltip = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1755
 GetSearchType = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1848
 SetTab = <function> defined @BetterWardrobe/Modules/Wardrobe.lua:1207
}
event = "TRANSMOG_COLLECTION_SOURCE_REMOVED"
sourceID = 79064
categoryID = 2
visualID = 27268
canEnchant = false
icon = 1127588
isCollected = false
itemLink = "|cff0070dd|Hitem:134480::::::::70:253:::1:3524::::::|h[Epaulets of Deceitful Intent]|h|r"
transmogLink = "|cffff80ff|Htransmogappearance:79064|h[Epaulets of Deceitful Intent]|h|r"
_ = 1
setItem = <table> {
 12303 = <table> {
 }
}
itemID = 134480
_ = "Armor"
_ = "Mail"
itemEquipLoc = "INVTYPE_SHOULDER"
(for generator) = <function> defined =[C]:-1
(for state) = <table> {
 12303 = <table> {
 }
}
(for control) = 12303
setID = 12303
setInfo = <table> {
 armorType = "MAIL"
 sourceType = 18
 label = "Legion Dungeon Set"
 oldID = 2303
 setID = 12303
 itemData = <table> {
 }
 note = "NOTE_76"
 expansionID = 7
 mod = 0
 name = "Legion Dungeon Mail"
 filter = 4
 oldnote = 76
 uiOrder = 8014
 isClass = true
 setType = "ExtraSet"
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = 1
(*temporary) = <function> defined =[C]:-1
(*temporary) = <table> {
 134480 = 3
}
(*temporary) = 134480
(*temporary) = nil
(*te