[thomasjohnshannon]

I made a quick video to show what is going on. In Colorz if I comment out "UnitSelectionColor = GameTooltip_UnitColor" it will stop the error but as said in my first post it doesn't seem to matter what method you are using.

My nameplate addon hooks CompactUnitFrame_UpdateHealthColor with the following code.

hooksecurefunc("CompactUnitFrame_UpdateHealthColor", function(frame)
    if ( not nPlates.FrameIsNameplate(frame) ) then return end
 
    if ( not UnitIsConnected(frame.unit) ) then
        local r, g, b = 0.5, 0.5, 0.5
    else
        if ( frame.optionTable.healthBarColorOverride ) then
            local healthBarColorOverride = frame.optionTable.healthBarColorOverride
            r, g, b = healthBarColorOverride.r, healthBarColorOverride.g, healthBarColorOverride.b
        else
            local localizedClass, englishClass = UnitClass(frame.unit)
            local classColor = RAID_CLASS_COLORS[englishClass]
            if ( UnitIsPlayer(frame.unit) and classColor and frame.optionTable.useClassColors ) then
                    r, g, b = classColor.r, classColor.g, classColor.b
            elseif ( CompactUnitFrame_IsTapDenied(frame) ) then
                r, g, b = 0.1, 0.1, 0.1
            elseif ( frame.optionTable.colorHealthBySelection ) then
                if ( frame.optionTable.considerSelectionInCombatAsHostile and CompactUnitFrame_IsOnThreatListWithPlayer(frame.displayedUnit) ) then
                    if ( nPlatesDB.TankMode ) then
                        local target = frame.displayedUnit.."target"
                        local isTanking, threatStatus = UnitDetailedThreatSituation("player", frame.displayedUnit)
                        if ( isTanking and threatStatus ) then
                            if ( threatStatus >= 3 ) then
                                r, g, b = 0.0, 1.0, 0.0
                            elseif ( threatStatus == 2 ) then
                                r, g, b = 1.0, 0.6, 0.2
                            end
                        elseif ( nPlates.UseOffTankColor(target) ) then
                            r, g, b = nPlatesDB.OffTankColor.r, nPlatesDB.OffTankColor.g, nPlatesDB.OffTankColor.b
                        else
                            r, g, b = 1.0, 0.0, 0.0;
                        end
                    else
                        r, g, b = 1.0, 0.0, 0.0;
                    end
                else
                    r, g, b = UnitSelectionColor(frame.unit, frame.optionTable.colorHealthWithExtendedColors)
                end
            elseif ( UnitIsFriend("player", frame.unit) ) then
                r, g, b = 0.0, 1.0, 0.0
            else
                r, g, b = 1.0, 0.0, 0.0
            end
        end
    end
 
        -- Execute Range Coloring
 
    if ( nPlatesDB.ShowExecuteRange and nPlates.IsInExecuteRange(frame) ) then
        r, g, b = nPlatesDB.ExecuteColor.r, nPlatesDB.ExecuteColor.g, nPlatesDB.ExecuteColor.b
    end
 
    if ( r ~= frame.healthBar.r or g ~= frame.healthBar.g or b ~= frame.healthBar.b ) then
        frame.healthBar:SetStatusBarColor(r, g, b)
 
        if ( frame.optionTable.colorHealthWithExtendedColors ) then
            frame.selectionHighlight:SetVertexColor(r, g, b)
        else
            frame.selectionHighlight:SetVertexColor(1, 1, 1)
        end
 
        frame.healthBar.r, frame.healthBar.g, frame.healthBar.b = r, g, b
    end
 
        -- Healthbar Border Coloring
 
    if ( frame.healthBar.beautyBorder ) then
        for i = 1, 8 do
            if ( UnitIsUnit(frame.displayedUnit, "target") ) then
                frame.healthBar.beautyBorder[i]:SetVertexColor(r,g,b,1)
            else
                frame.healthBar.beautyBorder[i]:SetVertexColor(unpack(borderColor))
            end
        end
    end
end)

If you comment out "frame.healthBar.r, frame.healthBar.g, frame.healthBar.b = r, g, b" from the code the error is gone but since that is the code that actually sets the color it doesn't work without it.