Sometimes the addon stops suggesting spells for few sec during fight (venthyr 3-1-2-1-2-2-2 theotar + covenant leg).

291x HeroLib\Class\Unit\Aura.lua:32: attempt to index local 'ThisSpell' (a nil value)
[string "@herolib\Class\Unit\Aura.lua"]:32: in function <HeroLib\Class\Unit\Aura.lua:27>
[string "=(tail call)"]: ?
[string "@herolib\Class\Unit\Aura.lua"]:148: in function DebuffRemains' [string "@HeroRotation_Hunter\Survival.lua"]:155: in function Condition'
[string "@HeroRotation\Commons.lua"]:78: in function CastTargetIf' [string "@HeroRotation_Hunter\Survival.lua"]:410: in function <HeroRotation_Hunter\Survival.lua:346> [string "@HeroRotation_Hunter\Survival.lua"]:806: in function ?'
[string "@HeroRotation\Main.lua"]:449: in function <HeroRotation\Main.lua:427>

This should be fixed in commit b6efd46