error

401x MaxDps\Buttons.lua:505: attempt to concatenate local 'spellName' (a nil value)
[string "@MaxDps\Buttons.lua"]:505: in function `GlowSpell'
[string "@MaxDps\Buttons.lua"]:511: in function `GlowNextSpell'
[string "@MaxDps\Core.lua"]:281: in function `InvokeNextSpell'
[string "@MaxDps\Buttons.lua"]:320: in function <MaxDps\Buttons.lua:273>
[string "=[C]"]: in function `?'
[string "@MaxDps\Libs\AceTimer-3.0\AceTimer-3.0-17.lua"]:55: in function <...aceMaxDps\Libs\AceTimer-3.0\AceTimer-3.0.lua:50>

Locals:
self = <table> {
 NAME_PLATE_UNIT_REMOVED = <function> defined @MaxDps\Core.lua:183
 GlowSpell = <function> defined @MaxDps\Buttons.lua:496
 FetchSyncUI = <function> defined @MaxDps\Buttons.lua:372
 GlobalCooldown = <function> defined @MaxDps\Helper.lua:423
 DisableRotation = <function> defined @MaxDps\Core.lua:111
 CancelTimer = <function> defined @MaxDps\Libs\AceTimer-3.0\AceTimer-3.0.lua:147
 isMelee = true
 FetchButtonForge = <function> defined @MaxDps\Buttons.lua:441
 InitRotations = <function> defined @MaxDps\Core.lua:295
 SetDefaultModulePrototype = <function> defined @AskMrRobot\Libs\AceAddon-3.0\AceAddon-3.0.lua:440
 Classes = <table> {
 }
 AzeriteTraits = <table> {
 }
 Custom = <table> {
 }
 IsEnabled = <function> defined @AskMrRobot\Libs\AceAddon-3.0\AceAddon-3.0.lua:482
 ScheduleTimer = <function> defined @MaxDps\Libs\AceTimer-3.0\AceTimer-3.0.lua:94
 Glow = <function> defined @MaxDps\Buttons.lua:141
 RegisterMessage = <function> defined @AskMrRobot\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:116
 FetchLibActionButton = <function> defined @MaxDps\Buttons.lua:402
 visibleNameplates = <table> {
 }
 playerUnitFrame = <unnamed> {
 }
 SpecName = <function> defined @MaxDps\Helper.lua:204
 FetchG15Buttons = <function> defined @MaxDps\Buttons.lua:428
 ActiveDots = <table> {
 }
 SetEnabledState = <function> defined @AskMrRobot\Libs\AceAddon-3.0\AceAddon-3.0.lua:455
 GlowIndependent = <function> defined @MaxDps\Buttons.lua:464
 Spec = 2
 Flags = <table> {
 }
 OnEnable = <function> defined @MaxDps\Core.lua:131
 TimeToDie = <function> defined @MaxDps\TimeToDie.lua:38
 ItemSpells = <table> {
 }
 UnitAura = <function> defined @MaxDps\Helper.lua:369
 ThreatCounter = <function> defined @MaxDps\Helper.lua:679
 OnInitialize = <function> defined @MaxDps\Core.lua:22
 UNIT_ENTERED_VEHICLE = <function> defined @MaxDps\Core.lua:198
 ttd = <table> {
 }
 ExtractTooltip = <function> defined @MaxDps\Helper.lua:594
 RotationTimer = <table> {
 }
 GlowCooldown = <function> defined @MaxDps\Buttons.lua:480
 GlowNextSpell = <function> defined @MaxDps\Buttons.lua:509
 Spells = <table> {
 }
 GetName = <function> defined @AskMrRobot\Libs\AceAddon-3.0\AceAddon-3.0.lua:310
 PlayerAuras = <table> {
 }
 IsSpellInRange = <function> defined @MaxDps\Helper.lua:650
 Dump = <function> defined @MaxDps\Buttons.lua:454
 Colors = <table> {
 }
 AddCustomGlowOptions = <function> defined @MaxDps\Options.lua:256
 TargetPercentHealth = <function> defined @MaxDps\Helper.lua:563
 GlowEssences = <function> defined @MaxDps\Helper.lua:347
 Disable = <function> defined @AskMrRobot\Libs\AceAddon-3.0\AceAddon-3.0.lua:345
 SpellAvailable = <function> defined @MaxDps\Helper.lua:554
 FindSpell = <function> defined @MaxDps\Buttons.lua:460
 DebuffCounter = <function> defined @MaxDps\Helper.lua:701
 Print = <function> defined @MaxDps\Core.lua:58
 CreateOverlay = <function> defined @MaxDps\Buttons.lua:26
 PLAYER_TARGET_CHANGED = <function> defined @MaxDps\Core.lua:211
 FinalTexture = "Cooldown\ping4"
 AddItemButton = <function> defined @MaxDps\Buttons.lua:222
 PLAYER_TALENT_UPDATE = <function> defined @MaxDps\Core.lua:190
 SpellCharges = <function> defined @MaxDps\Helper.lua:529
 GlowClear = <function> defined @MaxDps\Buttons.lua:514
 InitTTD = <function> defined @MaxDps\TimeToDie.lua:12
 UnregisterEvent = <fun