Describe your environment:

• VuhDo version (e.g. v3.102, Classic or Retail): 3.113-classic
• World of Warcraft region (ie. Americas/Oceanic, EU, CN or KR): Americas
• World of Warcraft client language (eg. enUS): enUS

Summary of the issue:

Lua error pops up sporadically when threat meter is enabled -- possibly related to group roster changes?

Related error messages:

Message: Interface\AddOns\VuhDo\VuhDoToolbox.lua:1204: Usage: UnitDetailedThreatSituation("unit" [, "mob"])
Time: Wed Jul 15 09:56:17 2020
Count: 1
Stack: Interface\AddOns\VuhDo\VuhDoToolbox.lua:1204: Usage: UnitDetailedThreatSituation("unit" [, "mob"])
Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1441: in function <Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1276>

Locals: _ = VuhDo {
 0 = <userdata>
 HealComm_HealUpdated = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1572
 HealComm_HealModified = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1592
}
aTimeDelta = 0.018000
VUHDO_DEBUFF_ANIMATION = 0
VUHDO_updateAllDebuffIcons = <function> defined @Interface\AddOns\VuhDo\VuhDoBarCustomizerDebuffIcon.lua:205
VUHDO_GCD_UPDATE = false
tGcdStart = nil
tGcdDuration = nil
GetSpellCooldown = <function> defined =[C]:-1
VuhDoGcdStatusBar = VuhDoGcdStatusBar {
 0 = <userdata>
 isInverted = false
 SetVuhDoColor = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:480
 GetStatusBarColor = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:486
 SetIsInverted = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:595
 SetAlpha = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:492
 txOrient = 1
 SetStatusBarColor = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:474
 SetOrientation = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:574
 SetValue = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:498
 SetValueRange = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:524
 SetStatusBarTexture = <function> defined @Interface\AddOns\VuhDo\VuhDoPanelConvenience.lua:568
 texture = <unnamed> {
 }
}
GetTime = <function> defined =[C]:-1
sIsDirectionArrow = true
VuhDoDirectionFrame = VuhDoDirectionFrame {
 0 = <userdata>
 shown = false
}
VUHDO_updateDirectionFrame = <function> defined @Interface\AddOns\VuhDo\VuhDoDirections.lua:105
VUHDO_UIFrameFlash_OnUpdate = <function> defined @Interface\AddOns\VuhDo\VuhDoGuiToolbox.lua:842
tTimeDelta = 0
tSlowDelta = 0.396000
VUHDO_setTimerDelta = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1237
VUHDO_checkTimer = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1258
InCombatLockdown = <function> defined =[C]:-1
VUHDO_TIMERS = <table> {
 REFRESH_TOOLTIP = 1.099000
 REFRESH_DRAG = 0.050000
 BUFF_WATCH = 0.138000
 UPDATE_AGGRO = 0.300000
 REFRESH_CUDE_TOOLTIP = 0.138000
 UPDATE_HOTS = 0.082500
 RELOAD_PANEL = 0
 RELOAD_UI = -0.052000
 UPDATE_CLUSTERS = 0.075000
 MIRROR_TO_MACRO = 2
 UPDATE_RANGE = 0.048000
 RELOAD_ZONES = 3.450000
 RELOAD_ROSTER = 0
 RELOAD_RAID = -0.067000
 UPDATE_AOE = 0.142000
 CUSTOMIZE = -0.086000
 CHECK_PROFILES = 3.100000
 REFRESH_TARGETS = -1
 REFRESH_INSPECT = 2.100000
}
VUHDO_initOptions = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:261
VUHDO_FIRST_RELOAD_UI = true
VUHDO_RELOAD_PANEL_NUM = nil
VUHDO_VARIABLES_LOADED = true
VUHDO_doReloadRoster = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1201
VUHDO_checkResetTimer = <function> defined @Interface\AddOns\VuhDo\VuhDoEventHandler.lua:1244
sHotToggleUpdateSecs = 0.082500
tHotDebuffToggle = 1
VUHDO_updateAllHoTs = <function> defined @Interface\AddOns\VuhDo\VuhDoBarCustomizerHots.lua:742
VUHDO_INTERNAL_TOGGLES = <table> {
 7 = false
 14 = true
 15 = false
 37 = false
 16 = false
 17 = false
 18 = false
 36 = true
 20 = false
 22 = false
 32 = true
}
VUHDO_updateClusterHighlights = <function> defined @Interface\AddOns\VuhDo\VuhDoBarCustomizerClusters.lua:197
VUHDO_updateAllCyclicBouquets = <function> defined @Interface\AddOns\VuhDo\VuhDoBouquets.lua:630
HasFullControl = <function> defined =[C]:-1
VUHDO_LOST_CONTROL = false
VUHDO_updateAllRaidTargetIndices = <function> defined @Interface\AddOns\VuhDo\VuhDo.lua:472
VUHDO_updateAllRaidBars = <function> defined @Interface\AddOns\VuhDo\V