Ilya

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.

Kiitti! ??