Can someone explain this obj reference error

[Mindset]

I have posted some code in the EcoSystem - only to find out it later had an odd Obj Ref error. Doesn't stop the indicator working but nonetheless...
Here is the offending code and after much nashing of teeth I discovered this little bit is the error but I do not understand why.

    private void btn_Click(object sender, RoutedEventArgs rea)    
        {
        if(MouseClick)    // this is a bool
        MakeVisible();
     [COLOR=#c0392b] [B]  //else
        //return;[/B][/COLOR]
        }​

In explanation I have allowed the user the option to either click the button or simple use OnMouseEnter ( ie no click).
Why would return cause the error?
Any explanations welcomed.

[NinjaTrader_ChelseaB]

Hello Mindset,

I'm not able to reproduce.

Attached is a simple test script.
ButtonClickReturnTest_NT8.zip

Are you certain the issue is not within the MakeVisible() method?

[Mindset]

Well I suppose it could be but I can’t see it.

here is a link to the entire code. With the error lines included.
if I remove them the error disappears.

https://forum.ninjatrader.com/filedata/fetch?id=1298340

[NinjaTrader_ChelseaB]

Hello Mindset,

The script you have provided does not call return in the btn_Click handler method that I can see.

I recommend you make a copy of the script. Then remove all other logic except for the specific code you are investigating.