safeApply()

angular_module.config([ '$provide', function($provide) { 
  return $provide.decorator('$rootScope', [ '$delegate', function($delegate) { 
    $delegate.safeApply = function(fn) { 
      var phase = $delegate.$$phase; 
      if (phase === "$apply" || phase === "$digest") { 
        if (fn && typeof fn === 'function') { 
          fn(); 
        } 
      } else { 
        $delegate.$apply(fn); 
      } 
    };
    return $delegate; 
  }]); 
}]);