What steps will reproduce the problem?

1. Clicking another player or npc's portrait

1.6.7 wrath classic

error log

251x ...ce\AddOns\ShestakUI\Libs\oUF\Modules\ComboPoints.lua:42: attempt to compare boolean with number
[string "@interface\AddOns\ShestakUI\Libs\oUF\Modules\ComboPoints.lua"]:42: in function <...ce\AddOns\ShestakUI\Libs\oUF\Modules\ComboPoints.lua:9>
[string "=(tail call)"]: ?
[string "@interface\AddOns\ShestakUI\Libs\oUF\Events.lua"]:82: in function <Interface\AddOns\ShestakUI\Libs\oUF\Events.lua:80>
[string "=(tail call)"]: ?

Locals:
self = oUF_Target {
0 =
__tags =

{
}
UNIT_MAXPOWER = {
}
UNIT_SPELLCAST_CHANNEL_START = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:116
unitEvents = {
}
UNIT_PET = defined @interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:224
UNIT_HEALTH_FREQUENT = {
}
UNIT_MAXHEALTH = {
}
__elements = {
}
UNIT_POWER_FREQUENT = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
PARTY_MEMBER_ENABLE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Health.lua:109
Power = oUF_Target_Power {
}
UNIT_POWER_BAR_SHOW = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
DebuffHighlight = {
}
backdrop = oUF_TargetBackdrop {
}
UNIT_HAPPINESS = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
Health = oUF_Target_Health {
}
RAID_TARGET_UPDATE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\RaidTargetIndicator.lua:38
UNIT_SPELLCAST_SENT = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:26
UNIT_SPELLCAST_INTERRUPTED = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:336
UNIT_EXITED_VEHICLE = defined @interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:55
style = "Shestak"
UNIT_CONNECTION = {
}
UNIT_SPELLCAST_CHANNEL_UPDATE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:236
ComboPoints = oUF_Target_ComboBar {
}
UNIT_SPELLCAST_CHANNEL_STOP = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:299
UNIT_SPELLCAST_STOP = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:299
UNIT_SPELLCAST_START = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:116
RaidTargetIndicator = {
}
Auras = oUF_Target_Auras {
}
UNIT_SPELLCAST_DELAYED = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:236
Castbar = oUF_Target_Castbar {
}
PLAYER_ENTERING_WORLD = defined @interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:55
UNIT_THREAT_SITUATION_UPDATE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\ThreatIndicator.lua:91
UNIT_FLAGS = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
Level = {
}
PLAYER_TARGET_CHANGED = {
}
unit = "target"
UNIT_DISPLAYPOWER = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
DebuffHighlightAlpha = 1
UNIT_THREAT_LIST_UPDATE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\ThreatIndicator.lua:91
PARTY_MEMBER_DISABLE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Health.lua:109
UNIT_ENTERED_VEHICLE = defined @interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:55
HealPrediction = {
}
UNIT_FACTION = {
}
ThreatIndicator = {
}
UNIT_POWER_UPDATE = defined @interface\AddOns\ShestakUI\Libs\oUF\Modules\ComboPoints.lua:121
UNIT_AURA = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Auras_Classic.lua:267
Info = {
}
DebuffHighlightFilter = true
CHARACTER_POINTS_CHANGED = defined @interface\AddOns\ShestakUI\Libs\oUF\Modules\RaidDebuffs.lua:80
UNIT_POWER_BAR_HIDE = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Power.lua:133
colors = {
}
UNIT_SPELLCAST_FAILED = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\CastBar.lua:336
}
_ = "PLAYER_TARGET_CHANGED"
unit = nil
powerType = nil
element = oUF_Target_ComboBar {
1 = oUF_Target_Combo1 {
}
2 = oUF_Target_Combo2 {
}
3 = oUF_Target_Combo3 {
}
4 = oUF_Target_Combo4 {
}
5 = oUF_Target_Combo5 {
}
__owner = oUF_Target {
}
ForceUpdate = defined @interface\AddOns\ShestakUI\Libs\oUF\Modules\ComboPoints.lua:151
Colors = {
}
backdrop = oUF_Target_ComboBarBackdrop {
}
0 =
}
cur = 0
max = 5
(*temporary) = true
(*tem

additional information? -- Seems to be related to combo points --