LUA Error

x5  ...e\ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:89: attempt to compare number with nil
Stack: ...e\ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:89: in function 'CalculateAllChores'
...e\ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:66: in function 'Initialise'
...rface\ZygorGuidesViewer\GuideMenuNew-View.lua:89: in function 'Open'
...rface\ZygorGuidesViewer\GuideMenuNew-View.lua:648: in function <...rface\ZygorGuidesViewer\GuideMenuNew-View.lua:648>
Time: 2018/08/27 18:30:43 Index: 1/1
RealUI Version: 2.0.4
Locals:
self = <table> {
    RunTutorial = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Help.lua:511
    Gathering = <table> {}
    EnchantToScroll = <table> {}
    Crafting = <table> {}
    SecureHook = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:336
    RawHookScript = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:395
    farming_guides = <table> {}
    ShowLoadbuttonTooltip = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:957
    COLOR_DEMANDGOOD = ""
    MainFrame_EventHandler = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:434
    Farming = <table> {}
    RecipeLevels = <table> {}
    SetCurrentTab = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:724
    CreateHelpPopup = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Help.lua:266
    Update = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:99
    hooks = <table> {}
    CacheCraftingTooltip = <table> {}
    Hook = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:274
    COLOR_DEMANDLOW = ""
    UpdateSortingArrows = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:916
    RawHook = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:313
    InitialiseCraftingChores = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Crafting.lua:38
    CraftingItemToSpell = <table> {}
    COLOR_VENDOR = ""
    MakeTable_Crafting = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:599
    needToUpdate = true
    TIER_DEMAND_HIGH = 1
    ToggleInfoPage = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:1143
    CreateHelpContentPanel = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Help.lua:205
    TIER_DEMAND_MEDIUM = 0.5
    Auctions = <table> {}
    MakeTooltip = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:976
    mining = 103
    GetItemFlagsAndStatus = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:542
    SecureHookScript = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:410
    Chores = <table> {}
    OffsetCrafting = 0
    HideMenuTooltip = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:480
    dynamic_sort = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:392
    MakeInfoPages = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Info.lua:255
    MakeTable_Farming = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:484
    OffsetFarming = 0
    UpdateTimeStamp = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:820
    HookScript = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:366
    Initialise = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:35
    ShowWindow = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:775
    OffsetGathering = 0
    ApplySkin = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:231
    COLOR_DEMANDGREAT = ""
    knows_crafting = false
    IsHooked = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:493
    CalculateAllChores = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-Core.lua:76
    CreateMainFrame = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:245
    OffsetAuctions = 0
    HideWindow = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:803
    MakeTable_Gathering = <function> defined @ZygorGuidesViewer\GoldUI\Goldguide-View.lua:541
    UnhookAll = <function> defined @Bartender4\libs\AceHook-3.0\AceHook-3.0.lua:477
    Common = <table> {}
    UpdateSorting = <function> defined