What steps will reproduce the problem?
1. Clicking on Vendors

What is the expected output? What do you see instead?
That the vendor opens with no errors. I see a bug report popup.

What version of the product are you using?
Current version from bug.

Do you have an error log of what happened?

Date: 2012-01-17 18:36:15
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\DropTheCheapestThing\bagnon.lua line 9:
   attempt to call method 'GetItemSlotInfo' (a nil value)
Debug:
   [C]: GetItemSlotInfo()
   DropTheCheapestThing\bagnon.lua:9 SetBorderQuality()
   Bagnon\components\item.lua:257 Update()
   Bagnon\components\item.lua:193
      Bagnon\components\item.lua:192
   [C]: Show()
   Bagnon\components\item.lua:24
      Bagnon\components\item.lua:16
   (tail call): ?
   Bagnon\components\itemFrame.lua:246 AddItemSlot()
   Bagnon\components\itemFrame.lua:330 ReloadAllItemSlots()
   Bagnon\components\itemFrame.lua:189 UpdateEverything()
   Bagnon\components\itemFrame.lua:441 SetFrameID()
   Bagnon\components\itemFrame.lua:29 New()
   Bagnon\components\frame.lua:696 CreateItemFrame()
   Bagnon\components\frame.lua:706 PlaceItemFrame()
   Bagnon\components\frame.lua:427 Layout()
   Bagnon\components\frame.lua:213 UpdateLook()
   Bagnon\components\frame.lua:165
      Bagnon\components\frame.lua:161
   [C]: Show()
   ..\FrameXML\UIParent.lua:2506 UIFrameFade()
   ..\FrameXML\UIParent.lua:2527 UIFrameFadeIn()
   Bagnon\components\frame.lua:259 FadeFrame()
   Bagnon\components\frame.lua:74 action()
   Bagnon\utility\ears.lua:29 SendMessage()
   Bagnon\components\frameSettings.lua:51 SendMessage()
   Bagnon\components\frameSettings.lua:69 Show()
   Bagnon\main.lua:95 ShowFrame()
   Bagnon\main.lua:176 OpenAllBags()
   ..\FrameXML\MerchantFrame.lua:46
      ..\FrameXML\MerchantFrame.lua:45
   [C]: Show()
   ..\FrameXML\UIParent.lua:1607 SetUIPanel()
   ..\FrameXML\UIParent.lua:1451 ShowUIPanel()
   ..\FrameXML\UIParent.lua:1338
      ..\FrameXML\UIParent.lua:1334
   [C]: SetAttribute()
   ..\FrameXML\UIParent.lua:2044 ShowUIPanel()
   ..\FrameXML\MerchantFrame.lua:29
      ..\FrameXML\MerchantFrame.lua:20
AddOns:
  Swatter, v5.13.5258 (BoldBandicoot)
  NPCScan, v4.3.0.2
  NPCScanOverlay, v4.3.0.1
  ACP, v3.3.17
  Armory, vv9.11.0
  ArmoryGuildBank, vv9.11.0
  Atlas, v1.21.1
  AtlasLootLoader, vv6.05.02
  AucAdvanced, v5.13.5258 (BoldBandicoot)
  AucFilterBasic, v5.13.5258 (BoldBandicoot)
  AucFilterOutlier, v5.13.5258.5187(5.13/embedded)
  AucMatchUndercut, v5.13.5258.5232(5.13/embedded)
  AucStatHistogram, v5.13.5258 (BoldBandicoot)
  AucStatiLevel, v5.13.5258 (BoldBandicoot)
  AucStatPurchased, v5.13.5258 (BoldBandicoot)
  AucStatSales, v5.13.5258.4838(5.13/embedded)
  AucStatSimple, v5.13.5258 (BoldBandicoot)
  AucStatStdDev, v5.13.5258 (BoldBandicoot)
  AucStatWOWEcon, v5.13.5258.4828(5.13/embedded)
  AucUtilAHWindowControl, v5.13.5258.5133(5.13/embedded)
  AucUtilAppraiser, v5.13.5258.5241(5.13/embedded)
  AucUtilAskPrice, v5.13.5258.5160(5.13/embedded)
  AucUtilAutoMagic, v5.13.5258.5224(5.13/embedded)
  AucUtilCompactUI, v5.13.5258.5254(5.13/embedded)
  AucUtilEasyBuyout, v5.13.5258.5241(5.13/embedded)
  AucUtilFixAH, v5.13.5258 (BoldBandicoot)
  AucUtilItemSuggest, v5.13.5258.5224(5.13/embedded)
  AucUtilPriceLevel, v5.13.5258.5241(5.13/embedded)
  AucUtilScanButton, v5.13.5258.5153(5.13/embedded)
  AucUtilScanFinish, v5.13.5258.5153(5.13/embedded)
  AucUtilScanProgress, v5.13.5258.4979(5.13/embedded)
  AucUtilScanStart, v5.13.5258.5153(5.13/embedded)
  AucUtilSearchUI, v5.13.5258.5254(5.13/embedded)
  AucUtilSimpleAuction, v5.13.5258.5210(5.13/embedded)
  AucUtilVendMarkup, v5.13.5258.4828(5.13/embedded)
  Babylonian, v5.1.DEV.312(/embedded)
  BagBrother, v
  Bagnon, v4.3.5
  BeanCounter, v5.13.5258 (BoldBandicoot)
  BuyEmAll, v3.0.9
  Castbars, v
  Configator, v5.1.DEV.312(/embedded)
  DBMCore, v
  DebugLib, v5.1.DEV.312(/embedded)
  Dominos, v4.3.4
  DominosBufftimes, v
  DominosCast, v
  DominosRoll, v
  DominosXP, v
  DropTheCheapestThing, vv3.6.2
  Enchantrix, v5.13.5258 (BoldBandicoot)
  EnchantrixBarker, v5.13.5258 (BoldBandicoot)
  GearScore, v4.11.00.00
  GreenRange, v
  GTFO, v4.11.5
  Informant, v5.13.5258 (BoldBandicoot)
  LibExtraTip, v5.12.DEV.319(/embedded)
  LinkWrangler, v1.86
  LinkWranglerAuctioneer, v1.54
  OmniCC, v4.3.2
  Postal, v3.4.13
  RatingBuster, v
  Stubby, v5.13.5258 (BoldBandicoot)
  TenTonHammer, v1.0
  TipHelper, v5.12.DEV.315(/embedded)
  Titan, v5.0.12.40300 - Revision 519
  TitanClock, v5.0.12.40300
  TitanGold, v5.0.12.40300
  TitanGuild, v3.6l
  TitanLocation, v5.0.12.40300
  TitanPals, v80
  TitanRepair, v5.0.12.40300
  TitanTrashCan, vv4.0.0
  TitanVolume, v5.0.12.40300
  BlizRuntimeLib_enUS v4.3.0.40300 <us>
  (ck=a25)