Same here. Error was random. Also all WordPress updates were blocked (no updates shown).
If you use WPML, they have launched today Hotfix Release: WPML Multilingual CMS 4.6.7
It should repair some fatal PHP errors that could happen in specific cases.
Hi @d88pak
Do you also use active WP Mail SMTP Pro?
There could be some problem. I have changed to MailPoet, and same problem disappeared.
