KT Error

x12  ...Ons\Aurora\Skin\Blizzard_ObjectiveTracker.lua:54: attempt to call field '?' (a nil value)
Stack: ...Ons\Aurora\Skin\Blizzard_ObjectiveTracker.lua:54: in function <...Ons\Aurora\Skin\Blizzard_ObjectiveTracker.lua:50>
[C] in function 'AddObjective'
..._ObjectiveTracker\Blizzard_QuestObjectiveTracker.lua:377: in function <..._ObjectiveTracker\Blizzard_QuestObjectiveTracker.lua:315>
[C] in function 'Update'
...zzard_ObjectiveTracker\Blizzard_ObjectiveTracker.lua:1069: in function <...zzard_ObjectiveTracker\Blizzard_ObjectiveTracker.lua:1028>
[C] ?
!KalielsTracker\KalielsTracker.lua:505: in function 'ObjectiveTracker_Update'
...zzard_ObjectiveTracker\Blizzard_ObjectiveTracker.lua:788: in function 'ObjectiveTracker_MinimizeButton_OnClick'
!KalielsTracker\KalielsTracker.lua:218: in function <!KalielsTracker\KalielsTracker.lua:194>
!KalielsTracker\KalielsTracker.lua:2102: in function <!KalielsTracker\KalielsTracker.lua:2101>
Time: 2018/06/24 09:39:27 Index: 1/1
Locals:
self = <table> {
    OnFreeBlock = <function> defined @!KalielsTracker\KalielsTracker.lua:972
    contentsHeight = 0
    OnFreeTypedLine = <function> defined @Blizzard_ObjectiveTracker\Blizzard_QuestObjectiveTracker.lua:25
    Update = <function> defined =[C]
    hasSkippedBlocks = false
    usedBlocks = <table> {}
    oldContentsHeight = 0
    OnBlockHeaderClick = <function> defined @!KalielsTracker\KalielsTracker.lua:1279
    paddingBetweenButtons = 2
    buttonOffsets = <table> {}
    updateReasonEvents = 3
    Header = <unnamed> {}
    contentsAnimHeight = 0
    title = "Quests"
    SetBlockHeader = <function> defined =[C]
    updateReasonModule = 1024
}
block = <unnamed> {
    0 = <userdata>
    lines = <table> {}
    id = 49977
    currentLine = <unnamed> {}
    title = "[110] Summons to Orgrimmar"
    HeaderButton = ObjectiveTrackerBlocksFrameHeader {}
    _auroraHeight = 12.999999046326
    HeaderText = <unnamed> {}
    lineWidth = 221.00000047684
    used = true
    level = 110
    height = 27.999998092651
    module = <table> {}
}
objectiveKey = "QuestComplete"
text = "Speak with Nathanos Blightcaller."
lineType = nil
useFullHeight = 2
dashStyle = nil
colorStyle = nil
adjustForNoText = nil
line = <unnamed> {
    0 = <userdata>
    objectiveKey = "QuestComplete"
    dashStyle = 1
    Dash = <unnamed> {}
    Text = <unnamed> {}
    used = true
    width = 221.00000047684
}
template = "KT_ObjectiveTrackerLineTemplate"
(*temporary) = nil
(*temporary) = <unnamed> {
    0 = <userdata>
    objectiveKey = "QuestComplete"
    dashStyle = 1
    Dash = <unnamed> {}
    Text = <unnamed> {}
    used = true
    width = 221.00000047684
}
(*temporary) = "attempt to call field '?' (a nil value)"
Skin = <table> {
    GarrisonFollowerTooltipTemplate = <function> defined @Aurora\Skin\FrameXML\FloatingGarrisonFollowerTooltip.lua:52
    AchievementHeaderStatusBarTemplate = <function> defined @Aurora\Skin\Blizzard_AchievementUI.lua:240
    GossipFramePanelTemplate = <function> defined @Aurora\Skin\FrameXML\GossipFrame.lua:45
    UIPanelScrollUpButtonTemplate = <function> defined @Aurora\Skin\SharedXML\SecureUIPanelTemplates.lua:45
    PopupButtonTemplate = <function> defined @Aurora\Skin\FrameXML\ItemButtonTemplate.lua:109
    PetBattleUnitTooltipAuraTemplate = <function> defined @Aurora\Skin\Blizzard_PetBattleUI.lua:131
    TooltipBorderedFrameTemplate = <function> defined @Aurora\Skin\SharedXML\SharedUIPanelTemplates.lua:342
    SplashFeatureFrameTemplate = <function> defined @Aurora\Skin\FrameXML\SplashFrame.lua:11
    ComparisonPlayerTemplate = <function> defined @Aurora\Skin\Blizzard_AchievementUI.lua:314
    OptionsListButtonTemplate = <function> defined @Aurora\Skin\FrameXML\OptionsFrameTemplates.lua:42
    MoneyInputFrameTemplate = <function> defined @Aurora\Skin\FrameXML\MoneyInputFrame.lua:17
    HybridScrollBarTemplate = <function> defined @Aurora\Skin\SharedXML\HybridScrollFrame.lua:24
    ChannelButtonHeaderTemplate = <function> defined @Aurora\Skin\Blizzard_Channels.lua:57
    InputBoxTemplate = <function> defined @Aurora\Skin\SharedXML\SecureUIPanelTemplates.lua:16
    ContainerFrameHelpBoxTemplate = <function> defined @Aurora\Skin\FrameXML\ContainerFrame.lua:120
    GarrisonLargeFollowerXPFrameTemplate = <function> defined @Aurora\Skin\Blizzard_GarrisonUI.lua:249
    AchievementSearchPreviewButton = <function> defined @Aurora\Skin\Blizzard_AchievementUI.lua:149
    BankItemButtonBagTemplate = <function> defined @Aurora\Skin\FrameXML\BankFrame.lua:48
    MaximizeMinimizeButtonFrameTemplate = <function> defined @Aurora\Skin\SharedXML\SharedUIPanelTemplates.lua:485
    UIPanelScrollDownButtonTemplate = <function> defined @Aurora\Skin\SharedXML\SecureUIPanelTemplates.lua:56
    CollectionsBackgroundTemplate = <function> defined @Aurora\Sk