Hi!
At first, thanks a LOT, it's a favorite addon!

Describe the bug
Latest KkthnxUI from here.
Simple summon this pet (Gnomelia Gearheart battle pet) and get many errors like this:

Message: ...ace/AddOns/KkthnxUI/Modules/Tooltip/Elements/Pet.lua:17: attempt to concatenate field '?' (a nil value)
Time: Tue Nov 14 05:36:24 2023
Count: 2
Stack: ...ace/AddOns/KkthnxUI/Modules/Tooltip/Elements/Pet.lua:17: attempt to concatenate field '?' (a nil value)
[string "@Interface/AddOns/KkthnxUI/Modules/Tooltip/Elements/Pet.lua"]:17: in function UpdatePetInfo' [string "@Interface/AddOns/KkthnxUI/Modules/Tooltip/Elements/Pet.lua"]:37: in function CreatePetInfo'
[string "@Interface/AddOns/KkthnxUI/Modules/Tooltip/Core.lua"]:277: in function <Interface/AddOns/KkthnxUI/Modules/Tooltip/Core.lua:132>
[string "=(tail call)"]: ?
[string "=[C]"]: in function securecallfunction' [string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:162: in function <Interface/SharedXML/Tooltip/TooltipDataHandler.lua:157> [string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:182: in function <Interface/SharedXML/Tooltip/TooltipDataHandler.lua:178> [string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:218: in function <Interface/SharedXML/Tooltip/TooltipDataHandler.lua:208> [string "=[C]"]: in function SetAttribute'
[string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:243: in function <Interface/SharedXML/Tooltip/TooltipDataHandler.lua:236>
[string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:389: in function <Interface/SharedXML/Tooltip/TooltipDataHandler.lua:339>
[string "=[C]"]: in function securecallfunction' [string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:336: in function ProcessInfo'
[string "@Interface/SharedXML/Tooltip/TooltipDataHandler.lua"]:476: in function RebuildFromTooltipInfo' [string "@Interface/FrameXML/GameTooltip.lua"]:1057: in function RefreshData'
[string "@Interface/FrameXML/GameTooltip.lua"]:604: in function <Interface/FrameXML/GameTooltip.lua:593>

Locals: self = GameTooltip {
0 =
ItemTooltip = Frame {
}
SetHyperlink = defined =[C]:-1
SetAzeriteEssence = defined =[C]:-1
SetVoidDepositItem = defined =[C]:-1
SetTraitEntry = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
SetLootCurrency = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
SetWorldCursor = defined @Interface/FrameXML/GameTooltip.lua:1074
SetLootItem = defined =[C]:-1
GetSpell = defined @Interface/FrameXML/GameTooltip.lua:1112
SetQuestLogSpecialItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
SetRecipeReagentItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
SetMerchantItem = defined =[C]:-1
BottomOverlay = Texture {
}
SetSocketedRelic = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
ProcessInfo = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:335
NineSlice = Frame {
}
SetInventoryItem = defined =[C]:-1
SetUnitDebuffByAuraInstanceID = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
GetProcessingTooltipInfo = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:488
AddLineDataText = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:429
AppendInfo = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:525
SetSpellBookItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
textLeft1Font = "GameTooltipHeaderText"
AppendInfoWithSpacer = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:531
SetShapeshift = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
hasMoney = 1
SetArtifactPowerByID = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
textRight2Font = "GameTooltipText"
TopOverlay = Texture {
}
SetSocketedItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:539
SetUnitDebuff = defined

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
No

World of Warcraft Details:

• Game Version: [Retail]
• Patch Version: [e.g., 10.2.0]

Additional context
No