Error on Gear Advisor wow classic

This error message always appear to me when i change my weapon on warrior
=======================

Date: 2019-10-13 17:38:43

ID: 1

Error occured in: Global

Count: 1

Message: ..AddOnsDugisGuideViewerZGearAdvisor.lua line 332:

   attempt to perform arithmetic on local ‘slot’ (a nil value)

Debug:

   [C]: ?

   DugisGuideViewerZGearAdvisor.lua:332:

      DugisGuideViewerZGearAdvisor.lua:331

   (tail call): ?

   DugisGuideViewerZGearAdvisor.lua:369:

      DugisGuideViewerZGearAdvisor.lua:358

   DugisGuideViewerZGearAdvisor.lua:389:

      DugisGuideViewerZGearAdvisor.lua:388

   DugisGuideViewerZGearAdvisor.lua:398:

      DugisGuideViewerZGearAdvisor.lua:392

   DugisGuideViewerZGearAdvisor.lua:511: handler()

   …deViewerZLibsLibTipHooker-1.1LibTipHooker-1.1.lua:182:

      …deViewerZLibsLibTipHooker-1.1LibTipHooker-1.1.lua:177

   [C]: SetBagItem()

   ..FrameXMLContainerFrame.lua:1318: ContainerFrameItemButton_OnEnter()

   …eAddOnsBagnoncommonWildpantscomponentsitem.lua:379: ShowTooltip()

   …eAddOnsBagnoncommonWildpantscomponentsitem.lua:210: OnEnter()

   …eAddOnsBagnoncommonWildpantscomponentsitem.lua:392: UpdateTooltip()

   ..FrameXMLGameTooltip.lua:496:

      ..FrameXMLGameTooltip.lua:475

   [C]: ?

   [C]: ?

Locals:

AddOns:

  Swatter, v8.2.6377 (SwimmingSeadragon)

  ACP, v3.5.6 

  AdvancedInterfaceOptions, v1.3.3

  AtlasLootClassic, vv1.2.3

  AtlasLootClassicDungeonsAndRaids, vv1.2.3

  AucAdvanced, v8.2.6430 (SwimmingSeadragon)

  AucFilterBasic, v8.2.6364 (SwimmingSeadragon)

  AucScanData, v8.2.6365 (SwimmingSeadragon)

  AucStatHistogram, v8.2.6366 (SwimmingSeadragon)

  AucStatiLevel, v8.2.6370 (SwimmingSeadragon)

  AucStatPurchased, v8.2.6367 (SwimmingSeadragon)

  AucStatSimple, v8.2.6399 (SwimmingSeadragon)

  AucStatStdDev, v8.2.6369 (SwimmingSeadragon)

  AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)

  Auctionator, v8.1.0

  Bagnon, v8.2.16

  BeanCounter, v8.2.6422 (SwimmingSeadragon)

  Details, v

  DetailsTinyThreat, v

  DugisGuideViewerZ, v1.063

  ExtendedCharacterStats, v1.5

  GatherLite, v1.3.3-classic

  HealBot, v1.13.2.7

  HealBotTips, v1.13.2.7

  InFlightLoad, v1.13.003

  Informant, v8.2.6374 (SwimmingSeadragon)

  MapCoords, v0.31c

  OmniCC, v8.2.5

  Prat30, v3.7.36

  Prat30Libraries, v

  Quartz, v3.5.2

  Questie, v4.1.2 BETA 121 dff5a12

  Recount, vv1.13.2d

  Scrap, v13.19

  ScrapSpotlight, v13.19

  SlideBar, v8.2.6375 (SwimmingSeadragon)

  Stubby, v8.2.6376 (SwimmingSeadragon)

  TellMeWhen, v8.7.1

  TinyTooltip, v8.2.1

  TomTom, vv80200-1.0.7

  TradeSkillMaster, vv4.8.14

  WeakAuras, v2.15.2

  WeaponSwingTimer, v4.1.0

  WhatsTraining, v1.8.6

  ZygorGuidesViewerClassic, v1.0

  BlizRuntimeLib_enUS v1.13.2.11302 <none>

  (ck=594)