Hi,
I'm working in a project and I'm having problems with the last version of the plataform.

The problem is something like this:

Uncaught exception thrown in session handler.

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in _drupal_session_write() (line 209 of /Applications/MAMP/htdocs/tienda/includes/session.inc).

And is only when I tried to Add a link in Site settings-> Advanced settings-> Structure-> Menus

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Anybody has an explication?