Describe the Bug/Issue
LUA Error When in combat, hekili does not show next combat option. occuring since 1.0.3. rolling back to 1.0.1 works ok

To Reproduce
Steps to reproduce the behavior:
entering combat, will fail mid battle, on differnt keypress

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.

PUT ISSUE REPORT LINK HERE:
build: v9.0.5-1.0.4-beta2
level: 53 (53)
class: ROGUE
spec: assassination

talents: exsanguinate
iron_wire
leeching_poison
master_poisoner
nightstalker
poison_bomb
vigor

pvptalents: none

covenant: kyrian

conduits: none

soulbinds: []

sets: none

gear: ashjrakamas_shroud_of_resolve = 1
band_of_chronicled_deeds = 1
boots_of_the_insatiable_maw = 1
courageous_aspirants_breeches = 1
deathsnap_hood = 1
deathsnap_jerkin = 1
gonk_outrunner_belt = 1
gonk_outrunner_shoulderguards = 1
heart_of_azeroth = 1
misfiring_centurion_controller = 1
plaguebringers_dirk = 1
razzashi_tooth_medallion = 1
seal_of_dathremar = 1
sparring_trainers_grips = 1
undercity_tabard = 1
wristwraps_of_the_insatiable_maw = 1
zocalo_stabber = 1

legendaries: none

itemIDs: 157915, 157916, 157942, 157945, 158075, 158114, 165610, 165667, 165683, 169223, 173325, 173344, 173349, 173477, 174954, 175626, 45583

settings: aoe = 3
buffPadding = 0.25
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
enhancedRecheck = false
gcdSync = true
maxRefresh = 10
maxTime = 33
nameplateRange = 8
nameplates = true
package = Assassination
petbased = false
potion = phantom_fire
potionsReset = 20180919.1
throttleRefresh = false
throttleTime = false
envenom_pool_pct = 50
mfd_points = 3
mfd_waste = true
priority_rotation = false
solo_vanish = false

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

PUT ERROR MESSAGE(S) HERE:
Message: Interface\AddOns\Hekili\Hekili.lua:205: bad argument #4 to 'format' (string expected, got nil)
Time: Tue Mar 23 23:12:07 2021
Count: 1
Stack: Interface\AddOns\Hekili\Hekili.lua:205: bad argument #4 to 'format' (string expected, got nil)
[string "=[C]"]: ?
[string "@interface\AddOns\Hekili\Hekili.lua"]:205: in function Debug' [string "@Interface\AddOns\Hekili\Core.lua"]:1160: in function GetPredictionFromAPL'
[string "@interface\AddOns\Hekili\Core.lua"]:840: in function GetPredictionFromAPL' [string "@Interface\AddOns\Hekili\Core.lua"]:840: in function GetPredictionFromAPL'
[string "@interface\AddOns\Hekili\Core.lua"]:1367: in function GetNextPrediction' [string "@Interface\AddOns\Hekili\Core.lua"]:1746: in function ProcessHooks'
[string "@interface\AddOns\Hekili\Options.lua"]:10194: in function MakeSnapshot' [string "@Interface\AddOns\Hekili\Core.lua"]:1787: in function ProcessHooks'
[string "@interface\AddOns\Hekili\UI.lua"]:824: in function <Interface\AddOns\Hekili\UI.lua:689>

Locals: (*temporary) = "%8sAttempted to Pool Resources for Next Entry ( %s ), but the next entry is not usable because %s. Skipping."
(*temporary) = ""
(*temporary) = "vanish"
(*temporary) = nil
(*temporary) = "string expected, got nil"

Go ahead and update, should be resolved.