title: Enzyme computed Error - TypeError: Cannot read property 'find' of undefined
body: <p>There is an error</p>
  
  <p><strong>Vue warn]: Error in render: "TypeError: Cannot read property 'find' of undefined"</strong></p>
  
  <p>when I tested my vue component. I tried different methods but still got an undefined error. When I load All meetups it is working fine. But the  problem when I would like to get a signle event</p>
  
  <p><strong>store.js</strong></p>
  
  <pre><code>state: {
      loadMeetups :[
          { 
              imageUrl: 'https://upload.wikimedia.org/wikipedia/commons/4/47/New_york_times_square-terabass.jpg', 
              id: 'afajfjadjaaadja323',
               title: 'Meetup in New York' ,
               date:'2018-07-17'
  
          },
          { 
              imageUrl: 'https://upload.wikimedia.org/wikipedia/commons/1/14/Palais_de_Justice_%28Paris%29_June_2010.jpg', 
              id: 'aadsfhbkhlk1241',
               title: 'Meetup in Paris',
               date:'2018-07-19'
          }
      ],
      user: {
          id: 'afajfjadjaaadja323',
          registeredMeetups: ['aadsfhbkhlk1241']
      }
  }
  </code></pre>
  
  <p><strong>Meeetup.vue</strong></p>
  
  <pre><code>&lt;template&gt;
      &lt;v-container&gt;
          &lt;v-layout row wrap=""&gt;
              &lt;v-flex xs12&gt;
                &lt;v-card&gt;
                    &lt;v-card-title&gt;
                        &lt;h3 class="primary--text"&gt;{{ meetup.id }}&lt;/h3&gt;
                    &lt;/v-card-title&gt;
                    &lt;v-card-media
                       src="https://upload.wikimedia.org/wikipedia/commons/4/47/New_york_times_square-terabass.jpg"
                                   height="400px"
                    &gt;
  
                    &lt;/v-card-media&gt;
                    &lt;v-card-text&gt;
                        &lt;div class="info--text"&gt;17th July 2017 - Where it takes place&lt;/div&gt;
                        &lt;div&gt;Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.&lt;/div&gt;
                    &lt;/v-card-text&gt;
                    &lt;v-card-actions&gt;
                        &lt;v-spacer&gt;&lt;/v-spacer&gt;
                        &lt;v-btn class="red darken-1" dark=""&gt;Register&lt;/v-btn&gt;
                    &lt;/v-card-actions&gt;
                &lt;/v-card&gt;
              &lt;/v-flex&gt;
          &lt;/v-layout&gt;
      &lt;/v-container&gt;
  &lt;/template&gt;
  &lt;script&gt;
  export default {
      props: {
      id:String
    },
      computed:{
          meetup(){
              return this.$store.getters.loadedMeetup(this.id)
          }
      }
  }
  &lt;/script&gt;
  </code></pre>