Update: I installed latest version. LUA errors still registered and recorded by BugSack.
Hekili error issue reporting info:

build: v9.0.1-1.0.13
level: 50 (50)
class: PRIEST
spec: shadow

talents: ancient_madness
auspicious_spirits
body_and_soul
damnation
mind_bomb
searing_nightmare
unfurling_darkness

covenant: none

azerite: azerite_empowered = 3
azerite_globules = 1
death_throes = 1
heed_my_call = 1
impassive_visage = 1
resounding_protection = 1
searing_dialogue = 1
spiteful_apparitions = 3
thought_harvester = 1
unstable_flames = 1
vampiric_speed = 1

essences: [essence_of_the_focusing_iris] = 3, breath_of_the_dying = 3, memory_of_lucid_dreams = 3, the_crucible_of_flame = 3

sets/legendaries/artifacts: none

gear: artisan_officers_shirt = 1
ashjrakamas_shroud_of_resolve = 1
heart_of_azeroth = 1
leggings_of_the_drowned_lord = 1
lurking_schemers_band = 1
mithril_wristwatch = 1
moonpriests_sash = 1
neural_synapse_enhancer = 1
renowned_guild_tabard = 1
sirensong_garments = 1
smartly_plumed_cap = 1
squallshaper_mantle = 1
thornwoven_band = 1
thousandyear_pickled_egg = 1
vile_manipulators_bracelets = 1
vile_manipulators_handguards = 1
vile_manipulators_treads = 1

legendaries: none

itemIDs: 117358, 117359, 155886, 157994, 158035, 158075, 159242, 162548, 165438, 168973, 169223, 173478, 173490, 173507, 175008, 69210, 89195

settings: aoe = 3
buffPadding = 0
custom1Name = Custom 1
custom2Name = Custom 2
cycle = false
cycle_min = 6
damage = true
damageDots = false
damageExpiration = 6
damagePets = false
damageRange = 0
debuffPadding = 0
enabled = true
gcdSync = true
maxRefresh = 10
maxTime = 33
nameplateRange = 8
nameplates = false
package = Shadow
petbased = false
potion = potion_of_rising_death
potionsReset = 20180919.1
throttleRefresh = false
throttleTime = false

toggles: cooldowns = true
custom1 = false
custom2 = false
defensives = true
essences = true
interrupts = true
mode = single
potions = true

---

Version 9.0.1-1.0.12
Running on current retail version of game.
My LUA bug collection addon registers this:

19897x Hekili\UI.lua:1192: attempt to compare number with nil
[string "@Hekili\UI.lua"]:1192: in function `RefreshCooldowns'
[string "@Hekili\UI.lua"]:1215: in function <Hekili\UI.lua:1207>

Locals:
self = HekiliDisplayPrimary {
0 =
Activate = defined @Hekili\UI.lua:1293
index = 2
Active = true
firstForce = 224433.844000
UpdateKeybindings = defined @Hekili\UI.lua:644
Deactivate = defined @Hekili\UI.lua:1347
combatTime =

{
}
combatUpdates = {
}
GetPerimeterButtons = defined @Hekili\UI.lua:1359
RefreshCooldowns = defined @Hekili\UI.lua:1163
Initialized = true
Buttons = {
}
Recommendations = {
}
refreshTimer = 0.039000
Header = HekiliDisplayPrimaryHeader {
}
lastFlashTime = 0
auraTimer = 0
flashTimer = -1
lastUpdate = 225304.741000
UpdatePerformance = defined @Hekili\UI.lua:1402
glowTimer = -1.409000
numIcons = 4
Moving = false
delayTimer = 0.050000
alphaCheck = 0.073000
id = "Primary"
Backdrop = HekiliDisplayPrimary_Backdrop {
}
alpha = 1
RecommendationsStr = "potion:void_eruption:focused_azerite_beam:neural_synapse_enhancer"
eventsTriggered = {
}
recTimer = 0.573000
superUpdate = true
criticalUpdate = true
UpdateAlpha = defined @Hekili\UI.lua:1130
targetTimer = 0.018000
rangeTimer = 0.118000
NewRecommendations = false
}
gStart = 225304.950000
gDuration = 1.040000
gExpires = 225305.990000
now = 225305.281000
conf = {
glow = {
}
displayPoint = "TOP"
builtIn = true
order = 1
delays = {
}
flash = {
}
anchorPoint = "BOTTOM"
rel = "CENTER"
frameLevel = 10
targets = {
}
numIcons = 4
border = {
}
range = {
}
enabled = true
relativeTo = "SCREEN"
keepAspectRatio = true
zoom = 30
captions = {
}
elvuiCooldown = false
frameStrata = "LOW"
queue = {
}
keybindings = {
}
x = -408.285492
name = "Primary"
primaryHeight = 50
primaryWidth = 50
indicators = {
}
visibility = {
}
y = -160.428345
}
(for generator) = defined =[C]:-1
(for state) = {
1 = {
}
2 = {
}
3 = {
}
4 = {
}
5 = {
}
6 = {
}
7 = {
}
8 = {
}
9 = {
}
10 = {
}
}
(for control) = 1
i = 1
rec = {
actionName = "potion"
index = 1
scriptType = "simc"
item = 152559
list = "default"
listName = "default"
resources = {
}
texture = 2057564
ActScript = "buff.bloodlust.react | target.time_to_die <= 80 | target.health.pct < 35"
script = "Shadow:default:2"
pack = "Shadow"
actionID = -152559
wait = 0
ActElements = {
}
display = "Primary"
action = 2
}
ability = {
gcd = "off"
charges = 1
id = -5
startsCombat = false
handler = defined @Hekili\Classes.lua:1984
funcs = {
}
name = "|cff00ccff[Potion]|r"
toggle = "potions"
realCast = 0
key = "potion"
}
cd = Hekili_Primary_B1_Cooldown {
0 =
_occ_priority = 1
_occ_show = false
lastDuration = 0
_occ_kind = "default"
_occ_duration = 0
_occ_start = 0
_occ_draw_swipe = true
_occ_settings = {
}
lastStart = 0
}
start = 0
duration = 0
(*temporary) = nil
(*temporary) = 0
(*temporary) = 0
(*temporary) = 0
(*temporary) = "attempt to compare number with nil"
Hekili = {
GetTTD = defined @Hekili\Targets.lua:794
DeserializeStyle = defined @Hekili\Options.lua:8868
modules = {
}
EmbedAbilityOptions = defined @Hekili\Options.lua:3623
Scripts = {
}
GetDeathClockByGUID = defined @Hekili\Targets.lua:779
GetPetBasedTargetSpells = defined @Hekili\Targets.lua:88
After = defined @Hekili\Utils.lua:268
NewSpellInfo = true
Run = defined @Hekili\Hekili.lua:263
UpdateDisplayVisibility = defined @Hekili\UI.lua:1600
IsEnabled = defined @A