WowAce

Currently only seen in Pre-SL event Northrend, haven't checked anywhere else.

Found by disabling all addons and enabling them one at a time until was able to duplicate by turning on only libraries and SuF.  I have Ace3 and LibInit as standalone libs.

9x ...ard_ObjectiveTracker\Blizzard_QuestSuperTracking.lua:42: attempt to index upvalue 'SuperTrackEventFrame' (a nil value)
[string "@Blizzard_ObjectiveTracker\Blizzard_QuestSuperTracking.lua"]:42: in function `QuestSuperTracking_ShouldHighlightDungeons'
[string "@Blizzard_SharedMapDataProviders\DungeonEntranceDataProvider.lua"]:53: in function `UpdateSupertrackedHighlight'
[string "@Blizzard_SharedMapDataProviders\DungeonEntranceDataProvider.lua"]:34: in function `RefreshAllData'
[string "@Blizzard_MapCanvas\MapCanvas_DataProviderBase.lua"]:76: in function `OnMapChanged'
[string "@Blizzard_MapCanvas\Blizzard_MapCanvas.lua"]:559: in function `OnMapChanged'
[string "@Blizzard_MapCanvas\Blizzard_MapCanvas.lua"]:59: in function `SetMapID'
[string "@Blizzard_BattlefieldMap\Blizzard_BattlefieldMap.lua"]:196: in function <...\Blizzard_BattlefieldMap\Blizzard_BattlefieldMap.lua:172>

Locals:
uiMapID = 118
(*temporary) = nil
(*temporary) = "attempt to index upvalue 'SuperTrackEventFrame' (a nil value)"
SuperTrackEventFrame = nil