Mentions to in text cause parsing to fail.

Hello!

As title says, any mention to a page or database will output the following error:
  `Error parsing json response: missing field 'created_time'`

Mentioning users works fine.

Steps to reproduce: create a database, create an item that is (or contains) a mention in title (or any created text field).

Hope it's an easy fix to merge whenever u have some free time :)