German client fighting against a russian mage.

Lua error:

`Message: Interface\AddOns\OmniBar\OmniBar.lua:538: attempt to index field '?' (a number value)
Time: Mon May 24 15:44:17 2021
Count: 3
Stack: Interface\AddOns\OmniBar\OmniBar.lua:538: attempt to index field '?' (a number value)
[string "@interface\AddOns\OmniBar\OmniBar.lua"]:538: in function <Interface\AddOns\OmniBar\OmniBar.lua:521>

Locals: self = OmniBar1 {
0 =
specs =

{
}
disabled = false
active = {
}
icons = {
}
zone = "pvp"
detected = {
}
cooldowns = {
}
key = "OmniBar1"
BASE_ICON_SIZE = 36
anchor = OmniBar1Anchor {
}
numIcons = 50
settings = {
}
container = OmniBar1Icons {
}
}
event = "COMBAT_LOG_EVENT_UNFILTERED"
_ = 1621863857.023000
subEvent = "SPELL_CAST_SUCCESS"a`

Similar Error while playing against another undead mage. I think it might happend the moment he used Cold Snap.

`Message: Interface\AddOns\OmniBar\OmniBar.lua:538: attempt to index field '?' (a number value)
Time: Tue May 25 19:10:27 2021
Count: 1
Stack: Interface\AddOns\OmniBar\OmniBar.lua:538: attempt to index field '?' (a number value)
[string "@interface\AddOns\OmniBar\OmniBar.lua"]:538: in function <Interface\AddOns\OmniBar\OmniBar.lua:521>

Locals: self = OmniBar1 {
0 =
specs =

{
}
disabled = false
active = {
}
icons = {
}
zone = "pvp"
detected = {
}
cooldowns = {
}
key = "OmniBar1"
BASE_ICON_SIZE = 36
anchor = OmniBar1Anchor {
}
numIcons = 50
settings = {
}
container = OmniBar1Icons {
}
}
event = "COMBAT_LOG_EVENT_UNFILTERED"
_ = 1621962627.510000
subEvent = "SPELL_CAST_SUCCESS"
_ = false
sourceGUID = "Player-4749-01B91DBE"
sourceName = "Zomby-Earthshaker"
sourceFlags = 66888
_ = 0
_ = ""
_ = nil
_ = -2147483648
_ = -2147483648
spellID = 11958
spellName = "Kälteeinbruch"
(for index) = 1
(for limit) = 5
(for step) = 1
i = 1
(for index) = 1
(for limit) = 4
(for step) = 1
j = 1
(*temporary) = 11426
(*temporary) = OmniBar1Icon5 {
0 =
HotKey = OmniBar1Icon5HotKey {
}
TargetTexture = {
}
NewActionTexture = {
}
class = "MAGE"
Border = OmniBar1Icon5Border {
}
Flash = OmniBar1Icon5Flash {
}
duration = 384
added = 1131255.981000
newitemglowAnim = {
}
spellID = 11958
icon = OmniBar1Icon5Icon {
}
Name = OmniBar1Icon5Name {
}
AutoCastable = {
}
SpellHighlightAnim = {
}
flashAnim = {
}
FocusTexture = {
}
NewItemTexture = {
}
SpellHighlightTexture = {
}
flash = {
}
NormalTexture = OmniBar1Icon5NormalTexture {
}
FlyoutBorderShadow = OmniBar1Icon5FlyoutBorderShadow {
}
FlyoutBorder = OmniBar1Icon5FlyoutBorder {
}
Count = OmniBar1Icon5Count {
}
AutoCastShine = OmniBar1Icon5Shine {
}
FlyoutArrow = OmniBar1Icon5FlyoutArrow {
}
cooldown = OmniBar1Icon5Cooldown {
}
sourceGUID = "Player-4749-01B91DBE"
}
(*temporary) = nil
(*temporary) = 1131255.981000
(*temporary) = false
(*temporary) = false
(*temporary) = OmniBar1 {
0 =
specs = {
}
disabled = false
active = {
}
icons = {
}
zone = "pvp"
detected = {
}
cooldowns = {
}
key = "OmniBar1"
BASE_ICON_SIZE = 36
anchor = OmniBar1Anchor {
}
numIcons = 50
settings = {
}
container = OmniBar1Icons {
}
}
(*temporary) = OmniBar1Icon5 {
0 =
HotKey = OmniBar1Icon5HotKey {
}
TargetTexture = {
}
NewActionTexture = {
}
class = "MAGE"
Border = OmniBar1Icon5Border {
}
Flash = OmniBar1Icon5Flash {
}
duration = 384
added = 1131255.981000
newitemglowAnim = {
}
spellID = 11958
icon = OmniBar1Icon5Icon {
}
Name = OmniBar1Icon5Name {
}
AutoCastable = {
}
SpellHighlightAnim = {
}
flashAnim = {
}
FocusTexture = {
}
NewItemTexture = {
}
SpellHighlightTexture = {
}
flash = {
}
NormalTexture = OmniBar1Icon5NormalTexture {
}
FlyoutBorderShadow = OmniBar1Icon5FlyoutBorderShadow {
}
FlyoutBorder = OmniBar1Icon5FlyoutBorder {
}
Count = OmniBar1Icon5Count {
}
AutoCastShine = OmniBar1Icon5Shine {
}
FlyoutArrow = OmniBar1Icon5FlyoutArrow {
}
cooldown = OmniBar1Icon5Cooldown {
}
sourceGUID = "Player-4749-01B91DBE"
}
(*temporary) = "attempt to index field '?' (a number value)"
CombatLogGetCurrentEventInfo = defined =[C]:-1
IsSourceHostile = defined @interface\AddOns\OmniBar\OmniBar.lua:515
spellIdByName = nil
cooldowns = {
20252 = {
}
35389 = {
}
1020 = {
}
19277 = {
}
30546 = {
}
14266 = {
}
1022 = {
}
14282 = {
}
14290 = {
}
10230 = {
}
17391 = {
}
12292 = {
}
11285 = {
}
27685 = {
}
2062 = `