What steps will reproduce the problem?
1. Logon a character
2.
3.

What is the expected output? What do you see instead?
Interface\\AddOns\\Stackpack\\Stackpack.lua:881 attempt to compare number with nil

What version of the product are you using?
3.0.1

Do you have an error log of what happened?
            ["message"] = "Interface\\AddOns\\Stackpack\\Stackpack.lua:881 attempt to compare number with nil",
            ["count"] = 76,
            ["addons"] = "  Swatter, v5.9.4960 (WhackyWallaby)\n  NPCScan, v4.0.3.6\n  NPCScanOverlay, v4.0.3.2\n  NPCScanOverlayBroker, v1.1.0\n  Ace3, v\n  AceGUI30SharedMediaWidgets, v4.0.0\n  AckisRecipeList, v2.2.2\n  ACP, v3.3.13 \n  AdvancedTradeSkillWindow, v\n  Altoholic, v4.0.006\n  ArcheoTriangle, v1.1.2\n  Archy, v1.7b8.bf6\n  Atlas, v1.18.2\n  AtlasBattlegrounds, v1.18.2\n  AtlasDungeonLocs, v1.18.2\n  AtlasOutdoorRaids, v1.18.2\n  AucAdvanced, v5.9.4960 (WhackyWallaby)\n  AucFilterBasic, v5.9.4960 (WhackyWallaby)\n  AucFilterOutlier, v5.9.4960.2531\n  AucMatchUndercut, v5.9.4960.2531\n  AucScanData, v5.9.4960 (WhackyWallaby)\n  AucStatHistogram, v5.9.4960 (WhackyWallaby)\n  AucStatiLevel, v5.9.4960 (WhackyWallaby)\n  AucStatPurchased, v5.9.4960 (WhackyWallaby)\n  AucStatSales, v5.9.4960.2842\n  AucStatSimple, v5.9.4960 (WhackyWallaby)\n  AucStatStdDev, v5.9.4960 (WhackyWallaby)\n  AucStatWOWEcon, v5.9.4960.2530\n  AucUtilAHWindowControl, v5.9.4960.3311\n  AucUtilAppraiser, v5.9.4960.2530\n  AucUtilAskPrice, v5.9.4960.3175\n  AucUtilAutoMagic, v5.9.4960.3142\n  AucUtilCompactUI, v5.9.4960.2530\n  AucUtilEasyBuyout, v5.9.4960.3583\n  AucUtilFixAH, v5.9.4960 (WhackyWallaby)\n  AucUtilGlypher, v5.9.4960.2545\n  AucUtilItemSuggest, v5.9.4960.3108\n  AucUtilPriceLevel, v5.9.4960.2545\n  AucUtilScanButton, v5.9.4960.2530\n  AucUtilScanFinish, v5.9.4960.2530\n  AucUtilScanProgress, v5.9.4960.2530\n  AucUtilScanStart, v5.9.4960.4819\n  AucUtilSearchUI, v5.9.4960.3655\n  AucUtilSimpleAuction, v5.9.4960.4546\n  AucUtilVendMarkup, v5.9.4960.2530\n  Babylonian, v5.1.DEV.130\n  BankItems, v40000\n  BeanCounter, v5.9.4960 (WhackyWallaby)\n  Broker2FuBar, v1.0\n  BrokerCPU, v40000\n  BrokerCurrency, v4.0.3-1.2.5\n  BrokerDurabilityInfo, v1.7\n  BrokerGarbage, v4.0v11\n  BrokerGarbageLootManager, v4.0v11\n  BrokerLocation, v\n  BrokerSmartBuff, v4.0a\n  BrokerSmartDebuff, v4.0a\n  BrokerSocialState, v\n  ChocolateBar, vv2.0.8\n  Collectinator, v2.0.1\n  Configator, v5.1.DEV.282\n  DataStore, v4.0.001\n  DataStoreAchievements, v4.0.001\n  DataStoreCharacters, v4.0.006\n  DebugLib, v5.1.DEV.275\n  DrDamage, v1.8.6_release\n  FBBroker, v1.6b (FB 0.9.9e2)\n  Fizzle, vv1.5.2\n  FizzleInventory, v1.8\n  GatherMate2, v1.12\n  GearScore, v4.3.02\n  GFWDisenchantPredictor, v4.0.2\n  GFWFactionFriend, v4.0.5\n  GoGoMount, v4.0.59\n  Informant, v5.9.4960 (WhackyWallaby)\n  JudgeHype, vVersion 4.0.3\n  LibRareSpawns, v1.0.30100\n  LibSharedMedia30, v3.0-62\n  LightHeaded, v333\n  LilSparkysWorkshop, v\n  MillHelp, v2.0.4\n  MillHelpGlyphs, v2.0.4\n  Molinari, v30300.3-Beta\n  myDebug, v1.6\n  nUI, v5.07.12 (Plus)\n  nUIAuraButtons, v5.03.02\n  nUIConfigGUI, v40000.1\n  nUIConfigHUD, v40000.1\n  nUIInfoPanelArchy, v1.02.00\n  nUIInfoPanelProfesions, v1.02.01\n  nUIInfoPanelSmartDebuff, v1.04.00\n  nUIInfoPanelStats, v1.02.02\n  Omen, v3.1.0\n  OmniCC, v4.0.waffles12\n  Postal, v3.4.4\n  Prat30, v3.4.15    \n  Prat30Libraries, v\n  ProfessionsBook, v3.1 beta\n  QuestGather, v\n  QuestHubber, v\n  QuestHubberAzeroth, v\n  QuestHubberCataclysm, v\n  QuestHubberNorthrend, v\n  QuestHubberOutland, v\n  RatingBuster, v\n  RecipeProfit, v4.0.3\n  Recount, v\n  sct, v6.2\n  sctd, v3.1\n  SlideBar, v5.9.4960 (WhackyWallaby)\n  SmartBuff, v4.0g\n  SmartDebuff, v4.0g\n  SnoofPigments, v1.1.0\n  SpeedyGonzales, v1.7.0\n  SpellFlash, v5.95.1\n  SpellFlashCore, v1.39\n  Stackpack, v3.0.1\n  Stubby, v5.9.4960 (WhackyWallaby)\n  tabDB, v\n  tekKompare, v4.0.0.9\n  TipHookerLib, v$Revision: 1 $\n  TomTom, vv40000-1.2.6\n  TourGuide, v4.0.0.57\n  VendorBait, v3.3.0.5\n  VitalWatch, v\n  XLoot10, v1.0.9\n  ZygorGuidesAlliance, v1.0\n  ZygorGuidesViewer, v1.0\n  BlizRuntimeLib_frFR v4.0.6.40000 <eu>\n  (ck=dfd)\n",
            ["timestamp"] = "2011-03-28 14:43:47",
            ["context"] = "Global",
            ["stack"] = "[C]: ?\nInterface\\AddOns\\Stackpack\\Stackpack.lua:881 in function `Organize'\nInterface\\AddOns\\Stackpack\\Stackpack.lua:693 in function `InitScan'\nInterface\\AddOns\\Stackpack\\Stackpack.lua:779 in function `QueryScan'\nInterface\\AddOns\\Stackpack\\Stackpack.lua:1006 in function `Stackpack_OnEvent'\n[string \"*:OnEvent\"]:1: in function <[string \"*:OnEvent\"]:1>\n",

Please provide any additional information below.