I received this error when opening a vendor window:

Date: 2023-01-18 14:05:19
ID: 1
Error occured in: Global
Count: 1
Message: Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua line 3094:
Usage: GetItemInfo(itemID|"name"|"itemlink")
Debug:
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: GetItemInfo()
[string "@Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua"]:3094: OnMerchant_show()
[string "@Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua"]:1099: ?()
[string "@Interface/AddOns/AtlasLootClassic/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:109:
...sic/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:109
[string "=[C]"]: ?
[string "@Interface/AddOns/AtlasLootClassic/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:19:
...sic/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:15
[string "@Interface/AddOns/AtlasLootClassic/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:54: Fire()
[string "@Interface/AddOns/Carbonite/Libs/AceEvent-3.0/AceEvent-3.0.lua"]:120:
.../AddOns/Carbonite/Libs/AceEvent-3.0/AceEvent-3.0.lua:119
Locals:
(*temporary) = defined =[C]:-1

AddOns:
Swatter, v3.4.6837 (SwimmingSeadragon)
AtlasLootClassic, vv3.1.0
AtlasLootClassicData, vv3.1.0
AtlasLootClassicDungeonsAndRaids, vv3.1.0
ATTClassic, v1.3.2
Bistooltip, v7.13
Carbonite, vv3.4.1-00001
CarboniteNotes, vv3.4.1-00001
CarboniteQuests, vv3.4.1-00001
CarboniteSocial, vv3.4.1-00001
CarboniteWarehouse, vv3.4.1-00001
Coordinates, v2.4
DBMCore, va119c9f
DBMStatusBarTimers, va119c9f
DBMVPVEM, v8a47308
GatherMate2, v1.47-classic
Recount, vv3.4.1b
SlideBar, v3.4.6851 (SwimmingSeadragon)
Stubby, v3.4.6816 (SwimmingSeadragon)
TradeSkillMaster, vv4.12.25
ZPerl, v7.0.4
ZPerlArcaneBar, v
ZPerlParty, v
ZPerlPartyPet, v
ZPerlPlayer, v
ZPerlPlayerBuffs, v
ZPerlPlayerPet, v
ZPerlRaidAdmin, v
ZPerlRaidFrames, v
ZPerlRaidHelper, v
ZPerlRaidMonitor, v
ZPerlRaidPets, v
ZPerlTarget, v
ZPerlTargetTarget, v
BlizRuntimeLib_enUS v3.4.1.30401
(ck=3c1)

Which vendor?

I'm sorry I don't remember, I think it was in Silvermoon - if it happens again I'll make note of which one

I've reloaded and get the same error - happened with the vendor Alorra in Sanctum of the Stars - Shadowmoon Valley - I haven't seen an update in the curseforge app though

I just got it on Kayren Soothallow (General Goods) in Tarren Mill:

Date: 2023-01-18 19:11:18
ID: 2
Error occured in: Global
Count: 1
Message: Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua line 3094:
Usage: GetItemInfo(itemID|"name"|"itemlink")
Debug:
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: GetItemInfo()
[string "@Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua"]:3094: OnMerchant_show()
[string "@Interface/AddOns/Carbonite.Warehouse/NxWarehouse.lua"]:1099: ?()
[string "@Interface/AddOns/AdiBags/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:109:
...ags/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:109
[string "=[C]"]: ?
[string "@Interface/AddOns/AdiBags/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:19:
...ags/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:15
[string "@Interface/AddOns/AdiBags/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:54: Fire()
[string "@Interface/AddOns/Carbonite/Libs/AceEvent-3.0/AceEvent-3.0.lua"]:120:
.../AddOns/Carbonite/Libs/AceEvent-3.0/AceEvent-3.0.lua:119
Locals:
(*temporary) = defined =[C]:-1

AddOns:
Swatter, v3.4.6837 (SwimmingSeadragon)
AdiBags, vv1.10.6
AdiBagsConfig, vv1.10.6
BigWigs, vv46.1-classic
Bistooltip, v7.13
Carbonite, vv3.4.1-00001
CarboniteNotes, vv3.4.1-00001
CarboniteQuests, vv3.4.1-00001
CarboniteSocial, vv3.4.1-00001
CarboniteWarehouse, vv3.4.1-00001
Clique, vv3.4.12-release
Dominos, v10.0.16
DominosCast, v
DominosProgress, v
DominosRoll, v
GTFO, v5.0
IceHUD, vv1.14.11
LeatrixPlus, v3.0.83
LibSharedMedia30, v3.0-130
MRT, v4720
Pawn, v2.7.15
Plater, vPlater-v548-Wrath
ProfessionMaster, v1.6.1
Questie, v7.4.7
RXPGuides, vv4.4.12
Skinner, vbeta10.47215.1
SlideBar, v3.4.6851 (SwimmingSeadragon)
SoulSort, v1.3 WOTLK
Stubby, v3.4.6816 (SwimmingSeadragon)
TotemTimers, v3.1.14
TradeSkillMaster, vv4.12.25
TradeSkillMasterAppHelper, vv4.12
WeakAuras, v5.3.5
ZPerl, v7.0.4
ZPerlArcaneBar, v
ZPerlParty, v
ZPerlPartyPet, v
ZPerlPlayer, v
ZPerlPlayerBuffs, v
ZPerlPlayerPet, v
ZPerlRaidAdmin, v
ZPerlRaidFrames, v
ZPerlRaidHelper, v
ZPerlRaidMonitor, v
ZPerlRaidPets, v
ZPerlTarget, v
ZPerlTargetTarget, v
BlizRuntimeLib_enUS v3.4.1.30401
(ck=48a)

Download version from this repo to test it.