Error getting length of nil field on guild sync

[Delfayne]

Currently have an error on background guild sync in latest version: R1.99144 in Season of Discovery

ID: 1
Error occured in: Global
Count: 1
Message: ...erface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua line 6982:
   attempt to get length of field '?' (a nil value)
Debug:
   [string "=(tail call)"]: ?
   [string "=[C]"]: ?
   [string "@Interface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua"]:6982: CheckingALTChanges()
   [string "@Interface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua"]:7961: PreCheckChanges()
   [string "@Interface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua"]:7686: MessageDeliveryCheck()
   [string "@Interface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua"]:8426:
      ...erface/AddOns/Guild_Roster_Manager/GRM_GuildSync.lua:8199
Locals:
(*temporary) = <function> defined =[C]:-1

AddOns:
  Swatter, v4.4.6991 (SwimmingSeadragon)
  Altoholic, v1.15.007
  AtlasLootClassic, vv3.2.0
  AtlasLootClassicData, vv3.2.0
  AtlasLootClassicDungeonsAndRaids, vv3.2.0
  Attune, v255
  AucAdvanced, v4.4.6991 (SwimmingSeadragon)
  AucFilterBasic, v4.4.6991 (SwimmingSeadragon)
  AucStatHistogram, v4.4.6991 (SwimmingSeadragon)
  AucStatiLevel, v4.4.6991 (SwimmingSeadragon)
  AucStatPurchased, v4.4.6991 (SwimmingSeadragon)
  AucStatSimple, v4.4.6991 (SwimmingSeadragon)
  AucStatStdDev, v4.4.6991 (SwimmingSeadragon)
  AucUtilFixAH, v4.4.6991 (SwimmingSeadragon)
  BagBrother, v
  Bagnon, v11.0.20
  BagnonScrap, v11.0
  Bartender4, v4.15.0
  BeanCounter, v4.4.6991 (SwimmingSeadragon)
  DataStore, v2023.11.17
  DataStoreAgenda, v2024.01.31
  DataStoreAuctions, v2024.01.31
  DataStoreCharacters, v2023.12.17
  DataStoreContainers, v2024.01.31
  DataStoreCrafts, v2024.01.31
  DataStoreInventory, v2024.01.31
  DataStoreMails, v2023.11.17
  DataStoreQuests, v2024.01.31
  DataStoreReputations, v2024.01.31
  DataStoreSpells, v2024.01.31
  DataStoreTalents, v2024.01.31
  DBMCore, v11.0.15
  DBMStatusBarTimers, v11.0.15
  DBMVPVEM, v68a8456
  Details, v#Details.13072.161
  DetailsCompare2, v
  DetailsEncounterDetails, v
  DetailsRaidCheck, v
  DetailsStreamer, v
  DetailsTinyThreat, v
  DetailsVanguard, v
  Enchantrix, v4.4.6991 (SwimmingSeadragon)
  EnchantrixBarker, v4.4.6991 (SwimmingSeadragon)
  Engraver, vv1.15.3.1
  ExtendedCharacterStats, v3.3.6
  FojjiCore, v1.4.0
  Gargul, v7.5.15
  GatherMate2, v1.47.5-classic
  GlobalIgnoreList, v1.15.2
  Guidelime, v4.005
  Guidelimeahmp, v1.4
  GuidelimeSage, v2.23
  GuideLimeTUGsVanilla, v1.67
  GuildRosterManager, v1.99144
  Informant, v4.4.6991 (SwimmingSeadragon)
  ItemRack, v4.00
  LeatrixMaps, v1.15.49
  LeatrixPlus, v1.15.49
  LFGBulletinBoard, v3.37
  NovaInstanceTracker, v1.78
  NovaSpellRankChecker, v1.3
  NovaWorldBuffs, v2.92
  Prat30, v3.9.55
  Questie, v10.3.15
  Ranker, v2024.09.22.02
  Scrap, v11.0.10
  SexyMap, vv11.0.2
  SilverDragon, vv2024.24
  SilverDragonHistory, vv2024.24
  SilverDragonOverlay, vv2024.24
  SilverDragonRangeExtender, vv2024.24
  SlideBar, v4.4.6991 (SwimmingSeadragon)
  Stubby, v4.4.6991 (SwimmingSeadragon)
  TidyPlatesThreatPlates, v12.0.9
  TipTac, v24.09.02
  TipTacItemRef, v24.09.02
  TipTacTalents, v24.09.02
  TradeSkillMaster, vv4.14.16
  TradeSkillMasterAppHelper, vv4.14.1
  unitscan, vv1.2.6
  VuhDo, v3.175-vanilla
  VuhDoOptions, v3.175-vanilla
  WaylaidSuppliesTooltip, v1.5.3
  WeakAuras, v5.17.1
  WeakAurasArchive, v5.17.1
  WhatsTraining, v6.0.2
  XLoot, v11-8
  XLootFrame, v11-8
  XLootGroup, v11-8
  XLootMaster, v11-8
  XLootMonitor, v11-8
  XLootOptions, v11-8
  XToLevel, v11.0.0-20240725-3
  ZPerl, v7.3.6
  ZPerlArcaneBar, v
  ZPerlParty, v
  ZPerlPartyPet, v
  ZPerlPlayer, v
  ZPerlPlayerBuffs, v
  ZPerlPlayerPet, v
  ZPerlRaidAdmin, v
  ZPerlRaidFrames, v
  ZPerlRaidHelper, v
  ZPerlRaidMonitor, v
  ZPerlRaidPets, v
  ZPerlTarget, v
  ZPerlTargetTarget, v
  BlizRuntimeLib v1.15.3.56626(US) <enUS>
  (ck=bdd)