Message: ...rface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:440: attempt to call upvalue 'UnitChannelInfo' (a nil value)
Time: Sun Sep 1 18:26:37 2019
Count: 1
Stack: ...rface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:440: attempt to call upvalue 'UnitChannelInfo' (a nil value)
...rface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:440: in function <...rface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:434>
(tail call): ?

Locals: self = SUI_playerFrame {
0 =
UNIT_PORTRAIT_UPDATE = defined @interface\AddOns\SpartanUI\libs\SUF\elements\portrait.lua:87
TextUpdate = defined @interface\AddOns\SpartanUI_PlayerFrames\scripts\FrameStyle_Classic.lua:97
PLAYER_UPDATE_RESTING = defined @interface\AddOns\SpartanUI\libs\SUF\elements\restingindicator.lua:58
__tags =

{
}
PLAYER_ENTERING_WORLD = defined @interface\AddOns\SpartanUI\libs\SUF\SUF.lua:196
ComboPoints = {
}
SUI_ClassIcon = {
}
UNIT_SPELLCAST_FAILED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:183
unitEvents = {
}
PARTY_LEADER_CHANGED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\leaderindicator.lua:59
UNIT_PET = defined @interface\AddOns\SpartanUI\core\SUF.lua:236
UNIT_HEALTH_FREQUENT = defined @interface\AddOns\SpartanUI\libs\SUF\elements\health.lua:177
StatusText = {
}
GroupRoleIndicator = {
}
UNIT_POWER_FREQUENT = defined @interface\AddOns\SpartanUI\libs\SUF\elements\power.lua:247
BuffAnchor = {
}
__elements = {
}
Castbar = {
}
UNIT_POWER_BAR_SHOW = defined @interface\AddOns\SpartanUI\libs\SUF\elements\power.lua:247
UNIT_MAXHEALTH = defined @interface\AddOns\SpartanUI\libs\SUF\elements\health.lua:177
PLAYER_REGEN_DISABLED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\combatindicator.lua:58
UNIT_FLAGS = {
}
UNIT_FACTION = {
}
UNIT_MAXPOWER = defined @interface\AddOns\SpartanUI\libs\SUF\elements\power.lua:247
Health = {
}
artwork = {
}
UNIT_DISPLAYPOWER = defined @interface\AddOns\SpartanUI\libs\SUF\elements\power.lua:247
UNIT_POWER_BAR_HIDE = defined @interface\AddOns\SpartanUI\libs\SUF\elements\power.lua:247
RAID_TARGET_UPDATE = defined @interface\AddOns\SpartanUI\libs\SUF\elements\raidtargetindicator.lua:62
PLAYER_TARGET_CHANGED = defined @interface\AddOns\SpartanUI\core\SUF.lua:236
UNIT_CONNECTION = {
}
Debuffs = {
}
Portrait = {
}
SmoothBar = defined @interface\AddOns\SpartanUI\libs\oUF_Plugins\oUF_Smooth.lua:17
GROUP_ROSTER_UPDATE = {
}
UNIT_SPELLCAST_CHANNEL_STOP = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:466
RaidTargetIndicator = {
}
unit = "player"
UNIT_SPELLCAST_DELAYED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:291
UNIT_SPELLCAST_CHANNEL_UPDATE = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:434
UNIT_SPELLCAST_CHANNEL_START = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:353
PLAYER_REGEN_ENABLED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\combatindicator.lua:58
UNIT_SPELLCAST_STOP = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:329
Level = {
}
UNIT_AURA = defined @interface\AddOns\SpartanUI\libs\SUF\elements\auras.lua:306
UNIT_SPELLCAST_START = defined @interface\AddOns\SpartanUI\libs\SUF\elements\castbar.lua:107
PORTRAITS_UPDATED = defined @interface\AddOns\SpartanUI\libs\SUF\elements\portrait.lua:87
PvPIndicator = {
}
ClassPower = {
}
Buffs = {
}
LeaderIndicator = {
}
mover = {
}
UNIT_SPELLCA

I'm getting a similar error when I cast Drain Life on my Warlock.

(using latest versions available through Twitch Client App)
SUI Version: 5.2.6
SUI Build: 505
Bartender4 version: 4.8.5