What steps will reproduce the problem?

1. Unit frame Disable
2. Nameplates error

What version of ShestakUI are you using? (Stating 'latest' is not useful)

ShestakUI Classic 0.92

Do you have an error log of what happened?

Message: ...ace\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:680: attempt to call field 'SetFontString' (a nil value)
Time: Sun Oct 27 23:29:27 2019
Count: 2
Stack: ...ace\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:680: attempt to call field 'SetFontString' (a nil value)
...ace\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:680: in function `PostCreateIcon'
...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:67: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:26>
...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:98: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:78>
...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:201: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:195>
...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:238: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:222>
(tail call): ?

Locals: element = {
0 =
CustomFilter = defined @interface\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:654
growth-y = "UP"
createdIcons = 2
spacing = 3.794466
size = 15.213439
__owner = ShestakNameplatesNamePlate2 {
}
anchoredIcons = 1
2 = ShestakNameplatesNamePlate2.AurasButton2 {
}
1 = ShestakNameplatesNamePlate2.AurasButton1 {
}
visibleAuras = 0
PostCreateIcon = defined @interface\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:676
visibleDebuffs = 0
ForceUpdate = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:303
initialAnchor = "BOTTOMRIGHT"
numDebuffs = 6
growth-x = "LEFT"
visibleBuffs = 0
numBuffs = 0
}
button = ShestakNameplatesNamePlate2.AurasButton2 {
overlay = {
}
UpdateTooltip = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:11
borderbottom = {
}
stealable = {
}
backdrop = {
}
borderright = {
}
count = {
}
borderleft = {
}
bordertop = {
}
0 =
icon = {
}
cd = ShestakNameplatesNamePlate2.AurasButton2Cooldown {
}
}
(*temporary) = nil
(*temporary) = ShestakNameplatesNamePlate2.AurasButton2 {
overlay = {
}
UpdateTooltip = defined @interface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:11
borderbottom = {
}
stealable = {
}
backdrop = {
}
borderright = {
}
count = {
}
borderleft = {
}
bordertop = {
}
0 =
icon = {
}
cd = ShestakNameplatesNamePlate2.AurasButton2Cooldown {
}
}
(*temporary) = "Interface\AddOns\ShestakUI\Media\Fonts\Pixel.ttf"
(*temporary) = 9.865613
(*temporary) = "OUTLINEMONOCHROME"
(*temporary) = "attempt to call field 'SetFontString' (a nil value)"
CreateVirtualFrame = defined @interface\AddOns\ShestakUI\Modules\Blizzard\Nameplates.lua:216
T =

{
SkinCheckBox = defined @interface\AddOns\ShestakUI\Core\Functions.lua:461
RaidDebuffsReverse = {
}
Scale = defined @interface\AddOns\ShestakUI\Core\PixelPerfect.lua:25
class = "WARRIOR"
RaidBuffs = {
}
dummy = defined @interface\AddOns\ShestakUI\Core\Constants.lua:6
SkinHelpBox = defined @interface\AddOns\ShestakUI\Core\Functions.lua:672
level = 53
PvPDebuffs = {
}
GetSpellID = defined @interface\AddOns\ShestakUI\Compatibility\Classic.lua:166
MoverFrames = {
}
CheckChat = defined @interface\AddOns\ShestakUI\Core\Functions.lua:43
ShiftBarUpdate = defined @interface\AddOns\ShestakUI\Modules\ActionBars\Core.lua:247
merge = {
}
CheckPlayerBuff = defined @interface\AddOns\ShestakUI\Core\Functions.lua:118
SkinStatusBarWidget = defined @interface\AddOns\ShestakUI\Core\Functions.lua:683
ShortValue = defined @interface\AddOns\ShestakUI\Core\Functions.lua:11
Role = "Melee"
DebuffBlackList = {
}

Any additional information? (example: WoW language if not English) (Attach screenshots here if available, do not link externally)

https://imgur.com/a/b5oBNF0