Go this one and it seems to correlate when I move my toon during a fight - not 100% sure

Message: ...nterface\AddOns\HeroRotation_Hunter\BeastMastery.lua:203: attempt to index global 'AR' (a nil value)
Time: Fri Aug 31 08:47:49 2018
Count: 17
Stack: ...nterface\AddOns\HeroRotation_Hunter\BeastMastery.lua:203: attempt to index global 'AR' (a nil value)
...nterface\AddOns\HeroRotation_Hunter\BeastMastery.lua:203: in function `?'
Interface\AddOns\HeroRotation\Main.lua:432: in function <Interface\AddOns\HeroRotation\Main.lua:410>

Locals: (*temporary) = nil
(*temporary) =

{
LastRemovedFromPlayerTime = 405507.197
LastAppliedOnPlayerTime = 405492.257
SpellType = "Player"
LastHitTime = 405492.257
LastCastTime = 405492.257
LastDisplayTime = 405492.099
SpellID = 19574
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'AR' (a nil value)"
HL = {
UnregisterForCombatPrefixEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:198
Tier21_2Pc = false
LoadRestores = defined @interface\AddOns\HeroLib\Events\Main.lua:300
MythicDungeon = defined @interface\AddOns\HeroLib\Class\Unit\Player\MythicDungeon.lua:47
RegisterForCombatPrefixEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:109
LiveRealm = defined @interface\AddOns\HeroLib\Core.lua:36
GetEnemies = defined @interface\AddOns\HeroLib\Misc\Enemies.lua:28
CombatEnded = 0
RangeTracker = {
}
GetInstanceInfo = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:32
RegisterForCombatSuffixEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:124
MainFrame = HeroLib_MainFrame {
}
OutOfCombatTime = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:94
UnregisterForSelfCombatEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:170
Latency = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:73
Utils = {
}
LoadOverrides = defined @interface\AddOns\HeroLib\Events\Main.lua:306
Pulse = defined @interface\AddOns\HeroLib\Main.lua:29
UnregisterForCombatEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:156
TTDRefresh = defined @interface\AddOns\HeroLib\Class\Unit\TimeToDie.lua:49
SpecID_ClassesSpecs = {
}
GUI = {
}
UnregisterForCombatSuffixEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:212
Timer = {
}
OffsetRemains = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:116
MAXIMUM = 40
FindKeyBinding = defined @interface\AddOns\HeroLib\Events\KeyBinding.lua:142
UnitNotInFront = {
}
RegisterForPetCombatEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:94
CacheHasBeenReset = false
LastUnitCycledTime = 0
BetaRealm = defined @interface\AddOns\HeroLib\Core.lua:46
GetInstanceDifficulty = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:67
HasTier = defined @interface\AddOns\HeroLib\Class\Unit\Player\Equipment.lua:113
Tier19_2Pc = false
Equipment = {
}
Tier20_2Pc = false
RegisterForCombatEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:64
LastUnitCycled = {
}
UnitNotInFrontTime = 0
PulseInitialized = true
WhitelistKeyBinding = defined @interface\AddOns\HeroLib\Events\KeyBinding.lua:138
Tier21_4Pc = false
Print = defined @interface\AddOns\HeroLib\Core.lua:60
CombatStarted = 405505.168
TTD = {
}
RegisterForEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:48
BuildVersion = defined @interface\AddOns\HeroLib\Core.lua:31
RegisterForSelfCombatEvent = defined @interface\AddOns\HeroLib\Events\Main.lua:79
CombatTime = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:89
Tier20_4Pc = false
GetEquipment = defined @interface\AddOns\HeroLib\Class\Unit\Player\Equipment.lua:24
BMPullTime = defined @interface\AddOns\HeroLib\Misc\ToSort.lua:99