TypeError: Cannot set property 'posts' of undefined - Vuejs

I create SPA with VueJs and Laravel. Homepage i get all posts via api laravel and axio resposive had data object. But i can not update to posts property.

• Error in chrome debug tool: TypeError: Cannot set property 'posts' of undefined - Vuejs

My code in Wellcome.vue

import { mapGetters } from 'vuex'
import axios from 'axios'
export default {
  name: 'welcome',

  layout: 'default',

  metaInfo: { titleTemplate: 'Welcome | %s' },

  computed: mapGetters({
    authenticated: 'authCheck'
  }),

  data: () => ({
    title: 'Demo Blog',
  }),
  props: {
      posts: {
        type: Object
      }
  },
  created () {
    axios.get('/api/posts')
    .then(function (response) {
      this.posts = response.data;
    })
    .catch(function (error) {
      console.log(error);
    });
  },
}

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