[Lybrial]

Always the same, after I asked I find the answer myself:

function UNITS:AdditionalPower_UpdateColor(_, unit)
    if (unit) then
        local self = self.AdditionalPower;
        local _, powerToken = UNITS:UnitPowerType(unit);
 
        if (powerToken == ADDITIONAL_POWER_BAR_NAME) then
            self:Hide();
        else
            local color = Colors:GetColorForPower(ADDITIONAL_POWER_BAR_NAME);
 
            self:SetStatusBarColor(color.r, color.g, color.b, color.a);
        end
    end
end

Once again thank you for the update guide