Error: Assertion Failed: calling set on destroyed object

[andrewbranch]

controllers/feature.js

        Ember['default'].RSVP.Promise.all(uploads).then(function () {
          model.save().then(function () {
            self.set('isKindOfDirty', false);
            setTimeout(function () {
              for (var j = 0; j < devices.length; j++) {
                self.set(devices[j] + 'FileUpload', null); // <--- Error
              }
            }, 500);
          });
        });