Vue-Chartjs not rendering graph

I am buiding a website with laravel and using the vuejs to manage the front-end. I want to display several charts through vue-chartjs but the vue-chartjs is not showing the graph even though the data is successfully passed. I have been following their website guide but the graph never displays. My Vue Component

<teplate>
    <div>
      ...
    <line-chart :chart-data="datacollection"></line-chart>
    <button @click="fillData()">Randomize</button>
    </div>
</template>

<script>
import Table from '../equipments/table.vue'
import LineChart from '../equipments/LineChart.js'
import DropDownList from '../equipments/dropdownlist.vue'
    export default {
    data () {
      return {
        datacollection: null
      }
    },
        components: {
            LineChart,
            Table,
            DropDownList
        },
    mounted () {
      this.fillData()
    },
    methods: {
      fillData () {
        this.datacollection = {
          labels: ['weqw','wewq'],
          datasets: [
            {
              label: 'Data One',
              backgroundColor: '#f87979',
              data: [this.getRandomInt(), this.getRandomInt()]
            }, 
            {
              label: 'Data One',
              backgroundColor: '#f87979',
              data: [this.getRandomInt(), this.getRandomInt()]
            }
          ]
        }
      },
      getRandomInt () {
        return Math.floor(Math.random() * (50 - 5 + 1)) + 5
      }
    }
  }
</script>

<style>
  .small {
    max-width: 600px;
    margin:  150px auto;
  }
</style>

my Chart.js

import { Line, mixins } from 'vue-chartjs'
const { reactiveProp } = mixins

export default {
  extends: Line,
  mixins: [reactiveProp],
  props: ['options'],
  mounted () {
    // this.chartData is created in the mixin.
    // If you want to pass options please create a local options object
    this.renderChart(this.chartData, this.options)
  }
}

Hope could receive some hints here, thanks in advance