✘ Error: Assertion Failed: calling set on destroyed object

service.js

import Ember from 'ember';

const { Service, run } = Ember;

/**
 * Ticking clock service.
 * We use this service to sync all our momentjs udpates every second
 * and not start one timer for each message.
 */
export default Service.extend({
  init: function() {
    this.seconds = 0;
    //run.later(this, this.giveMeATick, 1000);
  },

  giveMeATick: function() {
    this.set('tick', this.seconds);
    this.seconds += 1;
    //run.later(this, this.giveMeATick, 1000);
  },

  willDestroy: function() {
    run.cancel(this.giveMeATick);
  },
});

// Even though willDestroy is called I get the 
//     ✘ Error: Assertion Failed: calling set on destroyed object
// in my test.

// If both run.later calls are commented out then no errors.