Getting the following error when fighting groups of mobs:

Message: Interface\AddOns\HeroRotation_DeathKnight\Frost.lua:418: attempt to index field 'GCDasOffGCD' (a nil value)
Time: Fri Nov 27 17:18:35 2020
Count: 95
Stack: Interface\AddOns\HeroRotation_DeathKnight\Frost.lua:418: attempt to index field 'GCDasOffGCD' (a nil value)
[string "@interface\AddOns\HeroRotation_DeathKnight\Frost.lua"]:418: in function <Interface\AddOns\HeroRotation_DeathKnight\Frost.lua:371>
[string "@interface\AddOns\HeroRotation_DeathKnight\Frost.lua"]:605: in function `?'
[string "@interface\AddOns\HeroRotation\Main.lua"]:445: in function <Interface\AddOns\HeroRotation\Main.lua:423>

Locals: (*temporary) = defined @interface\AddOns\HeroRotation\Core.lua:132
(*temporary) =

{
LastCastTime = 0
LastHitTime = 0
LastAppliedOnPlayerTime = 0
LastRemovedFromPlayerTime = 0
SpellName = "Sacrificial Pact"
IsMelee = true
SpellType = "Player"
MaximumRange = 0
MinimumRange = 0
LastDisplayTime = 0
SpellID = 327574
}
(*temporary) = nil
(*temporary) = "Player-1171-086F8237"
(*temporary) = {
GCD = 1.207052
}
(*temporary) = "attempt to index field 'GCDasOffGCD' (a nil value)"
S = {
FrostFeverDebuff = {
}
ColdHeart = {
}
FrostStrike = {
}
UnholyStrengthBuff = {
}
ArcaneTorrent = {
}
EmpowerRuneWeapon = {
}
ColdHeartBuff = {
}
PoolRange = {
}
ArcanePulse = {
}
UnleashedFrenzyBuff = {
}
BloodFury = {
}
BitingCold = {
}
MindFreeze = {
}
Obliterate = {
}
DeathStrike = {
}
DeathStrikeBuff = {
}
HowlingBlast = {
}
BagofTricks = {
}
AncestralCall = {
}
ChainsofIce = {
}
SacrificialPact = {
}
FrostwyrmsFury = {
}
DeathAndDecay = {
}
Fireblood = {
}
LightsJudgment = {
}
RunicAttenuation = {
}
HypothermicPresence = {
}
EradicatingBlowBuff = {
}
SwarmingMist = {
}
RaiseDead = {
}
RazoriceDebuff = {
}
ShackleTheUnworthy = {
}
IcyTalonsBuff = {
}
DeathsDue = {
}
Icecap = {
}
RimeBuff = {
}
UnleashedFrenzy = {
}
GlacialAdvance = {
}
BreathofSindragosa = {
}
PillarofFrostBuff = {
}
KillingMachineBuff = {
}
Obliteration = {
}
FrozenPulseBuff = {
}
Frostscythe = {
}
EradicatingBlow = {
}
RemorselessWinter = {
}
AbominationLimb = {
}
EmpowerRuneWeaponBuff = {
}
HornofWinter = {
}
GatheringStorm = {
}
Berserking = {
}
Asphyxiate = {
}
IcyTalons = {
}
FrozenPulse = {
}
PillarofFrost = {
}
}
Player = {
UseCache = true
ChiDeficitPercentage = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:596
GCDStartTime = defined @interface\AddOns\HeroLib\Class\Unit\Player\Stat.lua:70
Race = defined @interface\AddOns\HeroLib\Class\Unit\Player\Main.lua:46
Insanityrain = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:648
FocusLossOnCastEnd = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:226
PainMax = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:725
IsInVehicle = defined @interface\AddOns\HeroLib\Class\Unit\Player\Main.lua:116
IsInParty = defined @interface\AddOns\HeroLib\Class\Unit\Player\Main.lua:33
EnergyDeficit = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:279
Fury = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:698
InstanceInfo = defined @interface\AddOns\HeroLib\Class\Unit\Player\Instance.lua:22
RageDeficit = defined @interface\AddOns\HeroLib\Class\Unit\Player\Power.lua:139
VersatilityDmgPct = defined @interface\AddOns\