What steps will reproduce the problem?

1.View target player equipment

What version of ShestakUI are you using? (Stating 'latest' is not useful)

ShestakUI_Classic 2.0.1

Do you have an error log of what happened?

Message: Interface/AddOns/Blizzard_InspectUI/Localization.lua:8: attempt to index global 'InspectTalentFrameSpentPoints' (a nil value)
Time: Wed Dec 6 18:17:30 2023
Count: 1
Stack: Interface/AddOns/Blizzard_InspectUI/Localization.lua:8: attempt to index global 'InspectTalentFrameSpentPoints' (a nil value)
[string "@Interface/AddOns/Blizzard_InspectUI/Localization.lua"]:8: in main chunk
[string "=[C]"]: ?
[string "=[C]"]: in function LoadAddOn' [string "@Interface_Vanilla/FrameXML/UIParent.lua"]:391: in function UIParentLoadAddOn'
[string "@Interface_Vanilla/FrameXML/UIParent.lua"]:430: in function InspectFrame_LoadUI' [string "@Interface_Vanilla/FrameXML/UIParent.lua"]:666: in function InspectUnit'
[string "@Interface/SharedXML/UnitPopupSharedButtonMixins.lua"]:200: in function OnClick' [string "@Interface/SharedXML/UnitPopupShared.lua"]:148: in function func'
[string "@Interface/FrameXML/UIDropDownMenu.lua"]:968: in function `UIDropDownMenuButton_OnClick'
[string "*UIDropDownMenuTemplates.xml:149_OnClick"]:1: in function <[string "*UIDropDownMenuTemplates.xml:149_OnClick"]:1>

Locals: (*temporary) = nil
(*temporary) = nil
(*temporary) = 1
(*temporary) = 2
(*temporary) = "InspectFrameTab2"
(*temporary) = defined =[C]:-1
(*temporary) = InspectFrameTab2Text {
0 =
}
(*temporary) = "CENTER"
(*temporary) = "InspectFrameTab2"
(*temporary) = "CENTER"
(*temporary) = 0
(*temporary) = 5
(*temporary) = "attempt to index global 'InspectTalentFrameSpentPoints' (a nil value)"

Any additional information? (example: WoW language if not English) (Attach screenshots here if available, do not link externally)

This is not a ShestakUI bug, but one caused by Blizzard on their end for the locale of the game that you are playing. You'll see that if you disable ShestakUI, the error will persist if you perform the same action.

This issue will only appear on non English interfaces，include chinese。May I ask if it can be resolved！

I cannot resolve this because this is not a problem with ShestakUI. It is a problem that Blizzard, the developers of World of Warcraft, must solve. It is a problem with the game itself and it's built in interface files.