Fatal error with FB.init: Uncaught OAuthException: Error validating access token-Collection of common programming errors

I have added like button to my application page:

  window.fbAsyncInit = function() {
    FB.init({appId: 'xxxxx', status: true, cookie: true,
             xfbml: true});
  };
  (function() {
    var e = document.createElement('script'); e.async = true;
    e.src = document.location.protocol +
      '//connect.facebook.net/en_US/all.js';
    document.getElementById('fb-root').appendChild(e);
  }());

With first reaload every thing is ok. After 2-3 page reload I have this error:

Uncaught OAuthException: Error validating access token. thrown

What is wrong with this? I have searched in stackoverflow but couldnot find any result. (only one)