WowAce

Hey, since today's maintenance (EU), I have LUA errors like this one when in combat and using abilities.

When disabling Bartender4, no more errors.

Message: ...lizzard_ActionBar/Shared/ActionButtonSpellAlerts.lua:112: attempt to call field 'IsAssistedCombatAction' (a nil value)
Time: Wed Jan 14 18:14:37 2026
Count: 1
Stack:
[Interface/AddOns/Blizzard_ActionBar/Shared/ActionButtonSpellAlerts.lua]:112: in function 'ShowAlert'
[Interface/AddOns/Bartender4/libs/LibActionButton-1.0/LibActionButton-1.0.lua]:2192: in function <...er4/libs/LibActionButton-1.0/LibActionButton-1.0.lua:2190>
[Interface/AddOns/Bartender4/libs/LibActionButton-1.0/LibActionButton-1.0.lua]:2210: in function <...er4/libs/LibActionButton-1.0/LibActionButton-1.0.lua:2207>
[Interface/AddOns/Bartender4/libs/LibActionButton-1.0/LibActionButton-1.0.lua]:1906: in function 'method'
[Interface/AddOns/Bartender4/libs/LibActionButton-1.0/LibActionButton-1.0.lua]:1239: in function <...er4/libs/LibActionButton-1.0/LibActionButton-1.0.lua:1236>
[Interface/AddOns/Bartender4/libs/LibActionButton-1.0/LibActionButton-1.0.lua]:1383: in function <...er4/libs/LibActionButton-1.0/LibActionButton-1.0.lua:1357>

Locals:
self = <table> {
activeAlerts = <table> {
}
SpellAlertType = <table> {
}
}
actionButton = BT4Button49 {
HotKey = BT4Button49HotKey {
}
action = 49
NewActionTexture = Texture {
}
Border = BT4Button49Border {
}
Flash = BT4Button49Flash {
}
flashing = 0
rangeTimer = -1
Name = BT4Button49Name {
}
Count = BT4Button49Count {
}
_state_action = 49
icon = BT4Button49Icon {
}
FlyoutBorderShadow = BT4Button49FlyoutBorderShadow {
}
AutoCastable = Texture {
}
SpellHighlightAnim = AnimationGroup {
}
header = BT4Bar5 {
}
state_actions = <table> {
}
id = 49
AutoCastShine = BT4Button49Shine {
}
SpellHighlightTexture = Texture {
}
__LAB_Version = 138
NormalTexture = BT4Button49NormalTexture {
}
config = <table> {
}
FlyoutBorder = BT4Button49FlyoutBorder {
}
_state_type = "action"
state_types = <table> {
}
FlyoutArrow = BT4Button49FlyoutArrow {
}
cooldown = BT4Button49Cooldown {
}
zoneAbilityDisabled = false
}
currentAlertType = nil
alertType = 1
(*temporary) = nil
(*temporary) = 49
(*temporary) = "attempt to call field 'IsAssistedCombatAction' (a nil value)"

I just updated to 4.17.1 but same issue remains.

Thank you.

I tried with older version  (4.16.6) and it works, no issue.