1x Skillet-Classic/UI/MainFrame.lua:716: attempt to concatenate a nil value
[string "@Skillet-Classic/UI/MainFrame.lua"]:716: in function `TradeButton_OnClick'
[string "*MainFrame.xml:67_OnClick"]:2: in function <[string "*MainFrame.xml:67_OnClick"]:1>

Locals:
self = <table> {
 DeleteIgnoreEntry = <function> defined @Skillet-Classic/UI/IgnoreList.lua:165
 VendorItemAvailable = <function> defined @Skillet-Classic/Inventory.lua:251
 SkillButton_NewGroup = <function> defined @Skillet-Classic/UI/MainFrame.lua:2330
 modules = <table> {
 }
 ClearQueue = <function> defined @Skillet-Classic/SkilletQueue.lua:269
 RecipeGroupInitFlatten = <function> defined @Skillet-Classic/RecipeGroups.lua:436
 MERCHANT_UPDATE = <function> defined @Skillet-Classic/UI/MerchantWindow.lua:196
 SkilletShow = <function> defined @Skillet-Classic/Skillet.lua:1208
 DisplayShoppingList = <function> defined @Skillet-Classic/UI/ShoppingList.lua:1299
 ShowQueueView = <function> defined @Skillet-Classic/UI/MainFrame.lua:3362
 TRADE_POTENTIAL_BIND_ENCHANT = <function> defined @Skillet-Classic/Skillet.lua:1367
 SKILL_LINES_CHANGED = <function> defined @Skillet-Classic/Skillet.lua:970
 ScheduleTimer = <function> defined @ElvUI_Libraries/Core/Ace3/AceTimer-3.0/AceTimer-3.0.lua:94
 FilterDropDown_OnShow = <function> defined @Skillet-Classic/UI/Filtering.lua:81
 castSpellName = "Leatherworking"
 hideTrivialRecipes = false
 RecipeGroupSort = <function> defined @Skillet-Classic/RecipeGroups.lua:410
 EnableResize = <function> defined @Skillet-Classic/UI/Utils.lua:129
 EnchantSpellToItem = <table> {
 }
 db = <table> {
 }
 bankBusy = false
 UpdateNotesWindow = <function> defined @Skillet-Classic/UI/RecipeNotes.lua:123
 interface = 11500
 SetEnabledState = <function> defined @ElvUI_Libraries/Core/Ace3/AceAddon-3.0/AceAddon-3.0.lua:420
 SkilletShowWindow = <function> defined @Skillet-Classic/Skillet.lua:1283
 AdditionalButtonsList = <table> {
 }
 CHAT = <function> defined @Skillet-Classic/DebugAids.lua:83
 IgnoreList_OnScroll = <function> defined @Skillet-Classic/UI/IgnoreList.lua:285
 SortDropdown_OnLoad = <function> defined @Skillet-Classic/UI/Sorting.lua:551
 pluginsOptions = <table> {
 }
 UnregisterAllEvents = <function> defined @AllTheThings/lib/CallbackHandler-1.0/CallbackHandler-1.0.lua:164
 RecipeGroupFlatten = <function> defined @Skillet-Classic/RecipeGroups.lua:457
 RecipeGroupMoveEntry = <function> defined @Skillet-Classic/RecipeGroups.lua:291
 EnablePauseButton = <function> defined @Skillet-Classic/UI/MainFrame.lua:202
 ReagentButtonSkillSelect = <function> defined @Skillet-Classic/UI/MainFrame.lua:2640
 ShowReagentDetails = <function> defined @Skillet-Classic/UI/MainFrame.lua:3253
 GetTradeSkillTools = <function> defined @Skillet-Classic/TradeskillInfo.lua:237
 bopCheck = <function> defined @Skillet-Classic/UI/MainFrame.lua:1713
 RecipeGroupClearEntries = <function> defined @Skillet-Classic/RecipeGroups.lua:128
 Disable = <function> defined @ElvUI_Libraries/Core/Ace3/AceAddon-3.0/AceAddon-3.0.lua:310
 SetSelectedSkill = <function> defined @Skillet-Classic/Skillet.lua:1559
 FixBugs = true
 Unhook = <function> defined @ElvUI_Libraries/Core/Ace3/AceHook-3.0/AceHook-3.0.lua:417
 InventoryFilterButton_OnShow = <function> defined @Skillet-Classic/UI/MainFrame.lua:2900
 SetTradeSkillToolTip = <function> defined @Skillet-Classic/UI/MainFrame.lua:1602
 LEARNED_SPELL_IN_TAB = <function> defined @Skillet-Classic/Skillet.lua:912
 ToggleTradeSkillOption = <function> defined @Skillet-Classic/Skillet.lua:1701
 tradeUpdate = 2
 L = <table> {
 }
 button_count = 29
 RemoveFromQueue = <function> defined @Skillet-Classic/SkilletQueue.lua:245
 UNIT_SPELLCAST_INTERRUPTED = <function> defined @Interface