android - try and catch with Parse -

i have button logs me out of parse if try log out without internet connection app crashes. tried put in try , catch app still crashes if attempt logout without internet connection. why that?

try {     log.i("appinfo", "button worked");      parseuser.logout();      intent = new intent(getapplicationcontext(), mainactivity.class);     startactivity(i);      toast.maketext(getapplicationcontext(), "logged out", toast.length_short).show();  } catch (exception e) {      toast.maketext(getapplicationcontext(), "check internet connection", toast.length_long).show();      log.i("appinfo", "catch successful");      e.printstacktrace(); }