On Retail, with the most recent version of KTA. mousing over the KTA broker:

1x KillThemAll/Settings/MinimapButton.lua:47: attempt to index global 'dataobj' (a nil value)
[string "@KillThemAll/Settings/MinimapButton.lua"]:47: in function OnEnter' [string "@Bazooka/Bazooka.lua"]:1582: in function showTip'
[string "@Bazooka/Bazooka.lua"]:1387: in function <Bazooka/Bazooka.lua:1378>

Locals:
self = BazookaPlugin_KillThemAll {
0 =
bzkPlugin =

{
}
}
(*temporary) = nil
(*temporary) = GameTooltip {
0 =
SetQuestLogRewardSpell = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
ItemTooltip = Frame {
}
SetHyperlink = defined =[C]:-1
SetAzeriteEssence = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetVoidDepositItem = defined =[C]:-1
SetTraitEntry = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetLootCurrency = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetWorldCursor = defined @FrameXML/GameTooltip.lua:952
SetLootItem = defined =[C]:-1
GetSpell = defined @FrameXML/GameTooltip.lua:990
SetQuestLogSpecialItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetRecipeReagentItem = defined =[C]:-1
SetMerchantItem = defined =[C]:-1
BottomOverlay = Texture {
}
SetSocketedRelic = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
ProcessInfo = defined =[C]:-1
NineSlice = Frame {
}
OnLoad = defined @FrameXML/GameTooltip.lua:927
SetUnitDebuffByAuraInstanceID = defined =[C]:-1
SetBagItem = defined =[C]:-1
AddLineDataText = defined @SharedXML/Tooltip/TooltipDataHandler.lua:324
SetSpellBookItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
textLeft1Font = "GameTooltipHeaderText"
SetShapeshift = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetArtifactPowerByID = defined =[C]:-1
textRight2Font = "GameTooltipText"
TopOverlay = Texture {
}
SetSocketedItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetUnitDebuff = defined =[C]:-1
SetMountBySpellID = defined =[C]:-1
SetTrainerService = defined =[C]:-1
TextLeft1 = GameTooltipTextLeft1 {
}
SetAzeritePower = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetLFGDungeonShortageReward = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetArtifactItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
StatusBar = GameTooltipStatusBar {
}
SetPossession = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetUnitAura = defined =[C]:-1
SetUnitBuffByAuraInstanceID = defined =[C]:-1
SetConduit = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetMinimapMouseover = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
GetItem = defined @FrameXML/GameTooltip.lua:986
SetRecipeResultItem = defined =[C]:-1
SetQuestPartyProgress = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
ProcessLineData = defined @SharedXML/Tooltip/TooltipDataHandler.lua:303
SetPvpTalent = defined =[C]:-1
SetExistingSocketGem = defined =[C]:-1
SetUnit = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetTotem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetVoidWithdrawalItem = defined =[C]:-1
SetInfoBackdropStyle = defined @SharedXML/Tooltip/TooltipDataHandler.lua:338
SetPetAction = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetSlottedKeystone = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetItemInteractionItem = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
SetLFGDungeonReward = defined @SharedXML/Tooltip/TooltipDataHandler.lua:444
GetUnit = defined @FrameXML/GameTooltip.lua:994
SetOwnedItemByID = defined @SharedXML/Tooltip/TooltipDataHandler.lua:4

Thank you for pointing this out!

Fixed in e2e4889