title: Fullcalendar TypeError: Cannot read property 'top' of null
body: <p>I'm getting an error and couldn't find any way to fix it:</p>
  
  <blockquote>
    <p>Fullcalendar TypeError: Cannot read property 'top' of null</p>
  </blockquote>
  
  <p>This my config:</p>
  
  <pre><code>config: {
      schedulerLicenseKey: 'GPL-My-Project-Is-Open-Source',
      defaultView: 'agendaOneDay',
      defaultDate: new Date().toISOString().slice(0, -14),
      minTime: '09:00',
      maxTime: '10:00',
      allDayDefault: false,
      allDaySlot: false,
      height: 500,
      slotLabelFormat: 'HH:mm',
      timeFormat: 'HH:mm',
      firstDay: 1,
      slotDuration: '00:15:00',
      columnFormat: 'ddd, DD MMM',
      editable: false,
      selectable: true,
  
      eventRenderWait: 1000,
      events: [],
  
      resources: [],
  
      views: {
        agendaOneDay: {
          type: 'agenda',
          duration: { days: 1 },
          buttonText: '1 day',
          groupByResource: true,
        },
        agendaThreeDay: {
          type: 'agenda',
          duration: { days: 3 },
          buttonText: '3 days',
          groupByResource: true,
        },
      },
  
      header: false,
  
      eventClick: this.clickPlace,
  
      eventRender: this.renderPlace,
    },
  </code></pre>
  
  <p>If someone knows how to fix this please help.</p>
  
  <p>And when I load developer page I getting this error.</p>
  
  <pre><code>TypeError: Cannot read property 'top' of null
  at CoordCache.getTopPosition (fullcalendar.js?228e:5594)
  at ResourceTimeGrid.TimeGrid.computeTimeTop (fullcalendar.js?228e:11988)
  at ResourceAgendaView.AgendaView.computeInitialDateScroll (fullcalendar.js?228e:11487)
  at ResourceAgendaView.View.applyScroll (fullcalendar.js?228e:3863)
  at ResourceAgendaView.ResourceViewMixin.applyScroll (scheduler.js?acd0:245)
  at ResourceAgendaView.View.applyQueuedScroll (fullcalendar.js?228e:3851)
  at ResourceAgendaView.View.popScroll (fullcalendar.js?228e:3846)
  at ResourceAgendaView.View.onRenderQueueStop (fullcalendar.js?228e:3570)
  at RenderQueue.intercept (fullcalendar.js?228e:1535)
  at RenderQueue.dispatch (jquery.js?1157:5183)
  </code></pre>