Ok, I get spammed with this error. It might be related. I am using Swatter from the Auctioneer package and it writes a warning that it is getting too many messages:
    Date: 2019-09-05 15:55:08
    ID: 6
    Error occured in: AddOn: DugisGuideViewerZ
    Count: 832
    Message: Note: AddOn DugisGuideViewerZ attempted to call a protected function (DugisSmallFrameContainer:SetPoint()) during combat lockdown.
       [C]: SetPoint()
       DugisGuideViewerZSmallFrame.lua:1297: AlignToTop()
       DugisGuideViewerZSmallFrame.lua:1308: OnDragStop()
       DugisGuideViewerZSmallFrame.lua:163: OnFrameUpdate()
      Swatter, v8.2.6377 (SwimmingSeadragon)
      AucAdvanced, v8.2.6385 (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, v8.2.6368 (SwimmingSeadragon)
      AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
      AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
      BeanCounter, v8.2.6381 (SwimmingSeadragon)
      Cleanup, v
      DugisGuideViewerZ, v1.017
      Enchantrix, v8.2.6392 (SwimmingSeadragon)
      FasterLooting, v1.0.0
      GFWFeedOMatic, v8.0
      GSE, v2.4.16
      GSEGUI, v2.4.16
      GSELDB, v2.4.16
      Informant, v8.2.6374 (SwimmingSeadragon)
      LeatrixPlus, v1.13.27
      NeatPlates, v1.13.2.12-Classic
      NeatPlatesAlvara, v5a
      NeatPlatesBlizzardPlates, v1.5
      NeatPlatesClassicPlates, v
      NeatPlatesGraphite, v
      NeatPlatesGrey, v
      NeatPlatesNeon, v
      NeatPlatesQuatre, v
      NeatPlatesRenaitre, vv7.0.3
      NeatPlatesRoth, v
      NeatPlatesSimple, v7.3.0
      NeatPlatesSlimHorizontal, v2.2
      NeatPlatesSlimVertical, v2.2
      NeatPlatesHub, v
      NeatPlatesWidgets, v
      OneBag3, vv3.3.13
      Postal, vv3.6.0
      SellJunk, v3.0.20
      SlideBar, v8.2.6375 (SwimmingSeadragon)
      SortBags, v
      Stubby, v8.2.6376 (SwimmingSeadragon)
      ZPerl, v5.7.6
      ZPerlParty, v
      ZPerlPartyPet, v
      ZPerlPlayer, v
      ZPerlPlayerBuffs, v
      ZPerlPlayerPet, v
      ZPerlTarget, v
      ZPerlTargetTarget, v
      BlizRuntimeLib_enUS v1.13.2.11302 <none>