WowAce

There is an error in Classic server when character flying, or mounted on a vehicle.

26x Bazooka\libs\LibJostle-3.0\LibJostle-3.0-90068.lua:347: attempt to call global 'UnitHasVehicleUI' (a nil value)
Bazooka\libs\LibJostle-3.0\LibJostle-3.0-90068.lua:347: in function `Refresh'
Bazooka\libs\LibJostle-3.0\LibJostle-3.0-90068.lua:180: in function `UIParent_ManageFramePositions'
Bazooka\libs\LibJostle-3.0\LibJostle-3.0-90068.lua:105: in function <Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:103>
[C]: in function `UIParent_ManageFramePositions'
FrameXML\MainMenuBar.lua:277: in function <FrameXML\MainMenuBar.lua:258>
[C]: in function `MainMenuBarVehicleLeaveButton_Update'
FrameXML\MainMenuBar.lua:255: in function <FrameXML\MainMenuBar.lua:254>

Locals:
self = <table> {
 Unregister = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:241
 topFrames = <table> {
 }
 ProcessQueue = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:297
 PLAYER_ENTERING_WORLD = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:159
 Refresh = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:322
 PLAYER_REGEN_DISABLED = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:314
 hooks = <table> {
 }
 TicketStatusFrame_OnEvent = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:167
 PLAYER_REGEN_ENABLED = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:309
 ACTIONBAR_UPDATE_STATE = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:155
 PLAYER_CONTROL_GAINED = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:305
 GetScreenBottom = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:197
 EnableTopAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:262
 WorldMapFrame_Hide = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:163
 IsBottomAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:276
 DisableTopAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:269
 RegisterTop = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:207
 IsTopAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:258
 UIParent_ManageFramePositions = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:179
 PlayerFrame_SequenceFinished = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:183
 FCF_UpdateCombatLogPosition = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:175
 EnableBottomAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:280
 DisableBottomAdjusting = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:287
 bottomAdjust = true
 GetScreenTop = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:187
 FCF_UpdateDockPosition = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:171
 topAdjust = true
 bottomFrames = <table> {
 }
 RegisterBottom = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:224
 frame = <unnamed> {
 }
}
screenHeight = 853.333435
topOffset = 833.333435
bottomOffset = 0
frames = <table> {
 1 = GroupLootFrame1 {
 }
 2 = TutorialFrameParent {
 }
 3 = FramerateLabel {
 }
 4 = DurabilityFrame {
 }
}
(*temporary) = nil
(*temporary) = "player"
(*temporary) = "attempt to call global 'UnitHasVehicleUI' (a nil value)"
fullyInitted = true
JostleFrame = <unnamed> {
 0 = <userdata>
 Schedule = <function> defined @Bazooka\libs\LibJostle-3.0\LibJostle-3.0.lua:140
}
tmp = <table> {
 1 = GroupLootFrame1 {
 }
 2 = TutorialFrameParent {
 }
 3 = FramerateLabel {
 }
 4 = DurabilityFrame {
 }
}
blizzardFrames = <table> {
 1 = "PlayerFrame"
 2 = "TargetFrame"
 3 = "MinimapCluster"
 4 = "PartyMemberFrame1"
 5 = "TicketStatusFrame"
 6 = "WorldStateAlwaysUpFrame"
 7 = "MainMenuBar"
 8 = "MultiBarRight"
 9 = "CT_PlayerFrame_Drag"
 10 = "CT_TargetFrame_Drag"
 11 = "Gypsy_PlayerFrameCapsule"
 12 = "Gypsy_TargetFrameCapsule"
 13 = "ConsolidatedBuffs"
 14 = "BuffFrame"
 15 = "DEFAULT_CHAT_FRAME"
 16 = "ChatFrame2"
 17 = "GroupLootFrame1"
 18 = "TutorialFrameParent"
 19 = "FramerateLabel"
 20 = "DurabilityFrame"
 21 = "CastingBarFrame"
 22 = "OrderHallCommandBar"
 23 = "MicroButtonAndBagsBar"
 24 = "UIWidgetTopCenterContainerFrame"
}
inCombat = false
_G = <table> {
 UpdateOnBarHighlightMarksBySpell = <function> defined @Int

To solve that, we need to change line 347 from

if inCombat or not HasFullControl() and not UnitHasVehicleUI("player") the
    

To

if inCombat or not HasFullControl() and UnitHasVehicleUI ~= nil and not UnitHasVehicleUI("player") then