How to get the title from the component in NUXT?

Question

Vue.js

How to correctly find out the title in the component after changing the route?
I have a pageTitle computed property in my component that I'm trying to evaluate like this:

computed: {
    pageTitle(){
        if (process.client) {
          return this.$parent.$metaInfo.title
        }
        else{
          return ''
        }
      }
    }

But it works every other time, sometimes when changing the route, an error occurs that the title is undefined