Describe the Bug/Issue
My LUA bug collector addon reported performance degrading issues due to a high volume of LUA errors.

To Reproduce
Open LUA bug collector addon (i.e., BugSack)

Expected behavior
No LUA errors being registered and recorded.

Screenshots
N/A

WHEN SUBMITTING AN ISSUE:

Please provide the following information.  Leaving it out may result in your ticket being ignored (because I won't have the information needed to explore your report).

1.  The information from the Issue Reporting tab ( /hekili > Issue Reporting ).  This provides your talent and gear information.  You can paste it to pastebin.com and provide a link here.

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

3.  If reporting an error (i.e., the addon freezes and/or disables itself), please install the BugSack and BugGrabber addons as they will enable you to paste the exact error message, with detail that will help me identify where the code error is located.  You can paste the error information here or use pastebin.com for that as well.

PUT ERROR MESSAGE(S) HERE:

My LUA Bug collecting addon recorded this:
625x Hekili\Hekili-v9.0.1-1.0.13.lua:325: bad argument #3 to 'format' (string expected, got nil)
[string "=[C]"]: ?
[string "@Hekili\Hekili-v9.0.1-1.0.13.lua"]:325: in function Debug' [string "@Hekili\Core.lua"]:1031: in function GetPredictionFromAPL'
[string "@Hekili\Core.lua"]:1263: in function GetNextPrediction' [string "@Hekili\Core.lua"]:1540: in function ProcessHooks'
[string "@Hekili\Options-Options.lua"]:9505: in function MakeSnapshot' [string "@Hekili\Core.lua"]:1550: in function ProcessHooks'
[string "@Hekili\UI.lua"]:825: in function <Hekili\UI.lua:689>

Locals:
(*temporary) = "%8sAction chosen: %s at %.2f!"
(*temporary) = ""
(*temporary) = nil
(*temporary) = 0
(*temporary) = "string expected, got nil"

Should be resolved in 1.0.14.