Crickey!: "Call to a member function getTimestamp() on boolean"

Hello. I'm working on an migration script to import my posts and comments from Google Blogger to Grav. Everything working fine, the comments are also rendered normally on the live pages.

But when try to view the latest comments on "localhost/grav/admin/comments/", I get an error like this: "Call to a member function getTimestamp() on boolean".


The comment.yaml files are imported like this:

```
title: 'Xposed Installer APK Fix Android 4.4.4 by Solarwarez Application Download'
lang: false
comments:
- {"text":"gan saya pake cyanogenMod 12.1 beta cocoknya pake xposed installer apa","date":"2016-03-30T03:31:10.200+07:00","author":"Hendry Wijayanto","email":"noreply@blogger.com","uri":"https://www.blogger.com/profile/16304488146178401806"}
- {"text":"Hmm... Kalo gak salah ada xposed khusus buat Android Lollipop, cari aja di repo.xposed.info","date":"2016-03-30T11:41:36.355+07:00","author":"iday raD","email":"noreply@blogger.com","uri":"https://www.blogger.com/profile/13765705053643369839"}
- {"text":"ok makasih gan.blognya bagus selalu update","date":"2016-03-31T02:12:50.493+07:00","author":"Hendry Wijayanto","email":"noreply@blogger.com","uri":"https://www.blogger.com/profile/16304488146178401806"}
```