When mob is sheeped I received following errors because I have OmniCC installed.

First when applied:
1x SheepMonitor\integrations.lua:62: attempt to call method 'Get' (a nil value) [string "@SheepMonitor\integrations.lua"]:62: in function ShowOmniCC'
[string "@SheepMonitor\main.lua"]:122: in function POLYMORPH_APPLIED' [string "@SheepMonitor\auras-Auras.lua"]:65: in function AuraApplied'
[string "@SheepMonitor\main.lua"]:93: in function ?' [string "@Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@ace3\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <Ace3\AceEvent-3.0\AceEvent-3.0.lua:119>`

Then when removed:
1x SheepMonitor\integrations.lua:77: attempt to call method 'Get' (a nil value) [string "@SheepMonitor\integrations.lua"]:77: in function HideOmniCC'
[string "@SheepMonitor\main.lua"]:161: in function POLYMORPH_REMOVED' [string "@SheepMonitor\auras-Auras.lua"]:91: in function func'
[string "@ace3\AceTimer-3.0\AceTimer-3.0-17.lua"]:57: in function <Ace3\AceTimer-3.0\AceTimer-3.0.lua:50>`

OmniCC used (v9.0.5): https://www.curseforge.com/wow/addons/omni-cc/files/3143166