NULL Points + Fire Fox

So I made a bone head mistake and had a null pointer error. essentially I had

user = loadUser();

if( user == null)

{

   Make login screen

}

else{

  populate user

} 

if(user.name == Sean)

{

   do something

}

So obviously that nulls out if I'm not logged in. Here's the rub, it worked fine in development mode. It didn't toss an error or anything. When I deployed it, I was met with no errors, only a blank screen. However, Firefox worked fine. This took me HOURS to figure out. 

Any idea why it works in dev mode and FireFox? I wish it stopped working ASAP (like it should) so I know, Oh, that line I just put in made it stop working instead of it happening hours later when I'm deploying it. 

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