What steps will reproduce the problem?

When I log onto one particular character, I get the error message posted.

The button does not show up on that character, and I get the message, even if all other addons are turned off, but it will show up on any of my other characters with no errors, even if they have the same addons turned on.  

The character in question has a large number of pets (87), if that has anything to do with it.
 

What version of the product are you using?
Pocket Menagerie version 1.1

Do you have an error log of what happened?
Date: 2008-12-25 17:06:46
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\Menagerie\Menagerie.lua line 181:
   attempt to index field '?' (a nil value)
Debug:
   [C]: ?
   Menagerie\Menagerie.lua:181 MenagerieUpdateButtons()
   Menagerie\Menagerie.lua:537 Menagerie_OnEvent()
   [string "*:OnEvent"]:1:
      [string "*:OnEvent"]:1
AddOns:
  Swatter, v5.1.3897 (SnaggleTooth)
  Align, v
  Aloft, v2.4.6
  AtlasLoot, v5.02.06
  AtlasLootFu, v1.2
  AucAdvanced, v5.1.3897 (SnaggleTooth)
  AucFilterBasic, v5.1.3897 (SnaggleTooth)
  AucFilterOutlier, v5.1.3897.2531
  AucMatchUndercut, v5.1.3897.2531
  AucStatClassic, v5.1.3897 (SnaggleTooth)
  AucStatHistogram, v5.1.3897 (SnaggleTooth)
  AucStatiLevel, v5.1.3897 (SnaggleTooth)
  AucStatPurchased, v5.1.3897 (SnaggleTooth)
  AucStatSales, v5.1.3897.2842
  AucStatSimple, v5.1.3897 (SnaggleTooth)
  AucStatStdDev, v5.1.3897 (SnaggleTooth)
  AucStatWOWEcon, v5.1.3897.2530
  AucUtilAHWindowControl, v5.1.3897.3311
  AucUtilAppraiser, v5.1.3897.2530
  AucUtilAskPrice, v5.1.3897.3175
  AucUtilAutoMagic, v5.1.3897.3142
  AucUtilCompactUI, v5.1.3897.2530
  AucUtilEasyBuyout, v5.1.3897.3583
  AucUtilItemSuggest, v5.1.3897.3108
  AucUtilPriceLevel, v5.1.3897.2545
  AucUtilScanButton, v5.1.3897.2530
  AucUtilScanFinish, v5.1.3897.2530
  AucUtilScanProgress, v5.1.3897.2530
  AucUtilSearchUI, v5.1.3897.3655
  AucUtilSimpleAuction, v5.1.3897.0
  AucUtilVendMarkup, v5.1.3897.2530
  Babylonian, v5.1.DEV.130
  Baggins, vBeta 1
  BagginsSearch, v1.0
  Baldrick, v1.5.118
  Bartender4, v4.2.0-Beta
  BigWigs, v2.0
  Blipstick, v3.0.2.7
  Bookworm, v
  ButtonFacade, v0.1Alpha
  ButtonFacadeApathy, v3.0.2
  ButtonFacadeCaith, v3.0.2
  ButtonFacadeElegance, v1.2
  ButtonFacadeEntropy, v3.0.2
  ButtonFacadeHKitty, v2.4.2
  ButtonFacadeItemRack, v1.3
  ButtonFacadeLiteStep, v3.0.2
  ButtonFacadeOnyx, v3.0.2
  ButtonFacadeSerenity, v3.0.2
  ButtonFacadesimpleSquare, v1.1
  ButtonFacadeSleek, v1.0
  ButtonFacadeTones, v2.4.3
  ButtonFacadeTrinity, v30000.1
  Capping, v3.0.004
  Carbonite, v2.54
  CarboniteTransfer, v1.01
  CastYeller, vv1.2
  Clique, vwowi:revision
  Configator, v5.1.DEV.130
  ControlFreak, v3.0.3.14
  CooldownCount, v3.0
  CooldownTimers3, v3.0 Beta
  CopyThat, v
  Cosplay, v1.0
  CowTip, v
  CraftList2, v3.0
  CurseProfiler, v
  CursorCastbar, v
  DebugLib, v5.1.DEV.130
  Deformat, v1.0 $Revision: 3817 $
  DruidStats, v3.0.5
  ElkBuffBars, v2.2.3-143
  Enchantrix, v5.1.3897 (SnaggleTooth)
  EnchantrixBarker, v5.1.3897 (SnaggleTooth)
  EnhTooltip, v5.1.3715 (SnaggleTooth)
  Examiner, v08.12.15
  FastDisenchant, v
  FBMergeDatabase, v0.9.6
  FBOutfitDisplayFrame, v0.9.6b
  FBTrackingFrame, v0.9.6
  FishingBuddy, v0.9.6j
  FluidFrames, v2.2
  FreeRefills, v2.0
  FuBar, v
  FuBarBabelFu, v1.0
  FuBarEmoteFu2, v0.1.5
  FuBarFishingBuddyFu, v2.2c
  FuBarMoneyFu, vv1.2
  FuBarRegenFu, v2.1.0
  FuTextures, v2.0
  Grid, v1.30000.2008112401
  GridIndicatorText3, v1.0
  GridManaBars, v0.7
  GridSideIndicators, v0.4
  GridStatusHostileUnit, v0.1
  GridStatusHots, v3.0b
  GridStatusLifebloom, v3.00.02.00 release
  HatTrick, v
  HideBobberTip, v
  Informant, v5.1.3897 (SnaggleTooth)
  InstantHealth, v1.1
  ItemPrice11, v1.1
  ItemPriceTooltip, v89
  ItemRack, v
  kgPanels, v1.12
  LibDogTag30, v1.0
  LibDogTagUnit30, v1.0
  LibPeriodicTable31, v3.1
  LibRock10, v
  LibSharedMedia30, v3.0-56
  LibStickyFrames20, v
  LightHeaded, v274
  LittleWigs, v3.0.0
  LonnyGameMenuFu, v$Revision: 103 $
  Menagerie, v
  OneCompanion, v3.0.3.$Revision: 38 $
  OPie, v
  Overachiever, v0.24
  PitBull, vv3.2.9
  PitBullAura, v2.0
  PitBullBanzai, v1.0
  PitBullBarFader, v0.1
  PitBullCastBar, v2.0
  PitBullCombatIcon, v2.0
  PitBullCombatText, v2.0
  PitBullComboPoints, v2.0
  PitBullDruidManaBar, v2.0
  PitBullExperienceBar, v2.0
  PitBullHealthBar, v2.0
  PitBullHideBlizzard, v2.0
  PitBullHighlight, v2.0
  PitBullLeaderIcon, v2.0
  PitBullMasterLooterIcon, v2.0
  PitBullPortrait, v2.0
  PitBullPowerBar, v2.0
  PitBullPvPIcon, v2.0
  PitBullRaidTargetIcon, v2.0
  PitBullRangeCheck, v0.2
  PitBullReadyCheckIcon, v2.0
  PitBullReputationBar, v2.0
  PitBullRestIcon, v2.0
  PitBullSpark, v2.0
  PitBullThreatBar, v2.0
  PitBullVisualHeal, v2.0
  PitBullVoiceIcon, v2.0
  Portfolio, v0.6
  Postal, v3.0.1
  Prat30, vRC10
  Prat30HighCPUUsageModules, v
  Prat30Libraries, v
  RatingBuster, v
  sct, v6.2
  sctd, v3.1
  SexyMap, v
  SharedMedia, v3.0
  SharedMediaBlizzard, v1.0
  SharedMediaAdditionalFonts, v1.0
  SharedMediaLib, v1.0
  SimpleBossWhisperer, v1.0
  SlideBar, v5.1.3897 (SnaggleTooth)
  SpellReminder, v2.0
  Stubby, v5.1.3897 (SnaggleTooth)
  Talented, v1.9.2
  WIM, v3.0.5
  XLoot, v0.9
  XLootGroup, v0.5
  XLootMaster, v0.7
  XLootMonitor, v0.7
  (ck=112d)

Please provide any additional information below.