19x SnowUpgradeTooltip/UpgradeTooltip.lua:30: attempt to perform arithmetic on local 'curLevel' (a nil value)
[string "@SnowUpgradeTooltip/UpgradeTooltip.lua"]:30: in function addUpgradeInfo' [string "@SnowUpgradeTooltip/UpgradeTooltip.lua"]:5: in function [string "=(tail call)"]: ? [string "=[C]"]: in function securecallfunction'
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:162: in function
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:182: in function
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:218: in function
[string "=[C]"]: in function SetAttribute' [string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:243: in function [string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:389: in function [string "=[C]"]: in function securecallfunction'
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:336: in function
[string "=(tail call)"]: ?
[string "@FrameXML/AlertFrameSystems.lua"]:425: in function `LootAlertFrame_OnEnter'
[string "*AlertFrameSystems.xml:951_OnEnter"]:2: in function <[string "*AlertFrameSystems.xml:951_OnEnter"]:1>

Locals:
self = {
addUpgradeInfo = defined @SnowUpgradeTooltip/UpgradeTooltip.lua:13
colorize = defined @SnowUpgradeTooltip/UpgradeTooltip.lua:80
OnLoad = defined @SnowUpgradeTooltip/UpgradeTooltip.lua:9
}

tooltip = GameTooltip {
0 =
ItemTooltip = Frame {
}

SetHyperlink = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetAzeriteEssence = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetVoidDepositItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetTraitEntry = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetLootCurrency = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetWorldCursor = defined @FrameXML/GameTooltip.lua:1074
SetLootItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
GetSpell = defined @FrameXML/GameTooltip.lua:1112
SetQuestLogSpecialItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetRecipeReagentItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetMerchantItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
BottomOverlay = Texture {
}

SetSocketedRelic = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
ProcessInfo = defined @SharedXML/Tooltip/TooltipDataHandler.lua:335
NineSlice = Frame {
}

SetInventoryItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetUnitDebuffByAuraInstanceID = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
GetProcessingTooltipInfo = defined @SharedXML/Tooltip/TooltipDataHandler.lua:488
AddLineDataText = defined @SharedXML/Tooltip/TooltipDataHandler.lua:429
AppendInfo = defined @SharedXML/Tooltip/TooltipDataHandler.lua:525
SetSpellBookItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
textLeft1Font = "GameTooltipHeaderText"
AppendInfoWithSpacer = defined @SharedXML/Tooltip/TooltipDataHandler.lua:531
SetShapeshift = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
hasMoney = 1
SetArtifactPowerByID = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
textRight2Font = "GameTooltipText"
TopOverlay = Texture {
}

SetSocketedItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetUnitDebuff = defined =[C]:-1
SetMountBySpellID = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetToyByItemID = defined =[C]:-1
TextLeft1 = GameTooltipTextLeft1 {
}

GetTooltipData = defined @SharedXML/Tooltip/TooltipDataHandler.lua:505
IsTooltipType = defined @SharedXML/Tooltip/TooltipDataHandler.lua:509
ClearHandlerInfo = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetArtifactItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
StatusBar = GameTooltipStatusBar {
}

SetPossession = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetUnitAura = defined =[C]:-1
SetUnitBuffByAuraInstanceID = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetConduit = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetMinimapMouseover = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
GetItem = defined @FrameXML/GameTooltip.lua:1108
SetRecipeResultItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
SetQuestPartyProgress = defined @SharedXML/Tooltip/TooltipDataHandler.lua:539
ProcessLineData = defined @SharedXML/Tooltip/TooltipD