Found nil for optional value?

I just can not figure this out :

  print(module)
  print(Globals.sharedInstance.dataModuleName)
  let kind:NSString = module[Globals.sharedInstance.dataModuleName] as! NSString

Will print this, and then crash for strange reason :

( //dic print
        {
        meta = no;
        module = IN;
        subject = LT;
        variable = A2;
    }
)
module    // print the right field we are looking for inside the dictionary .

fatal error: unexpectedly found nil while unwrapping an Optional value

But you can see that module is valid dictionary and also dataModuleName .

Crashing on the line let kind . whats wrong with it ?