Describe the bug

When I join a party of 5, with a healer and 3 DPS, this Lua Error appears

Do you have an error log of what happened?
Message: Interface/AddOns/DBM-Core/DBM-Core.lua:7188: attempt to index field '?' (a nil value)
Time: Mon May 27 14:41:54 2024
Count: 1
Stack: Interface/AddOns/DBM-Core/DBM-Core.lua:7188: attempt to index field '?' (a nil value)
[string "@Interface/AddOns/DBM-Core/DBM-Core.lua"]:7188: in function `func'
[string "@Interface/AddOns/DBM-Core/modules/Scheduler.lua"]:175: in function <Interface/AddOns/DBM-Core/modules/Scheduler.lua:166>

Locals: self = false
ignoreLoot =

{
MoveSpecialWarning = defined @Interface/AddOns/DBM-Core/modules/objects/SpecialWarning.lua:132
CopyAllModOption = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3262
PLAY_MOVIE = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7301
SortByTankAlpha = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7567
CopyProfile = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:2010
GetNumRealGroupMembers = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:2833
CHAT_MSG_WHISPER = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6971
GetCachedBossHealth = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7956
DungeonMusic = {
}
FireEvent = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:1918
CreateModLocalization = defined @Interface/AddOns/DBM-Core/modules/objects/Localization.lua:104
GetMyPlayerInfo = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:2739
ADDON_LOADED = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:1524
CANCEL_PLAYER_COUNTDOWN = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:4982
INSTANCE_GROUP_SIZE_CHANGED = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:2539
AddDefeatSound = defined @Interface/AddOns/DBM-Core/modules/Sounds.lua:123
GetDefeatSounds = defined @Interface/AddOns/DBM-Core/modules/Sounds.lua:116
GroupInCombat = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:8677
UPDATE_MOUSEOVER_UNIT = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:4070
GetSpellCooldown = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6521
UPDATE_BATTLEFIELD_STATUS = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3632
UnitAura = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6548
IsRanged = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7509
LFG_PROPOSAL_SHOW = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3541
ReleaseRevision = 20240527000000
RegisterShortTermEvents = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:1288
LOADING_SCREEN_DISABLED = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3853
GetUnitFullName = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:2744
IsClassic = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7350
UNIT_HEALTH_FREQUENT = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:5794
UNIT_DIED = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6665
IsTanking = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7736
FindInstanceIDs = defined @Interface/AddOns/DBM-Core/modules/DevTools.lua:91
CHALLENGE_MODE_RESET = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3901
UnitDebuff = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6589
LFG_ROLE_CHECK_SHOW = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:3532
Disable = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7039
ReceiveTimerInfo = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6743
Arrow = {
}
RangeCheck = {
}
ValidateSound = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:6336
IsHealer = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:7701
AddBattleMusic = defined @Interface/AddOns/DBM-Core/modules/Sounds.lua:218
LoadModByName = defined @Interface/AddOns/DBM-Core/DBM-Core.lua:4041
Debug = <fun

To Reproduce

Screenshots

Did you try having DeadlyBossMods as the only enabled addon and everything else (especially something like ElvUI) disabled?
No, the UI I use is Dominos and is up to date
Which version of DeadlyBossMods are you using?
DBM-Core-10.2.43-4-g0d2c510.zip
Was it working in a previous version? If yes, which was the last good one?
Not sure what last version I had, but Lua Error is new and attempted to fix by updating to this Version
Additional context

I pushed another update with very aggressive missing spec recovery, and then if it still can't find spec, it just gives up and treats you as a dps (catas default behavior anyways, dps unless specifically flagged as tank or healer so really basically DBM does nothing if it can't determine if you're a healer or tank)

Try new update and see