Additional uncaught exception thrown while handling exception.

<h1>Additional uncaught exception thrown while handling exception.</h1><h2>Original</h2><p>PDOException: SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query: SELECT base.tid AS tid, base.vid AS vid, base.name AS name, base.description AS description, base.format AS format, base.weight AS weight, base.uuid AS uuid, v.machine_name AS vocabulary_machine_name
FROM 
{taxonomy_term_data} base
INNER JOIN {taxonomy_vocabulary} v ON base.vid = v.vid
WHERE  (base.tid IN  (:db_condition_placeholder_0)) ; Array
(
    [:db_condition_placeholder_0] =&amp;gt; 96
)
 in DrupalDefaultEntityController-&gt;load() (line 198 of /var/www/office51/data/www/office-line86.ru/includes/entity.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT expire, value FROM {semaphore} WHERE name = :name; Array
(
    [:name] =&amp;gt; rules_get_cacherules_event_whitelist
)
 in lock_may_be_available() (line 167 of /var/www/office51/data/www/office-line86.ru/includes/lock.inc).</p><hr /><h1>Uncaught exception thrown in shutdown function.</h1><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {semaphore} 
WHERE  (value = :db_condition_placeholder_0) ; Array
(
    [:db_condition_placeholder_0] =&amp;gt; 1840279096adf423d022c17.83807630
)
 in lock_release_all() (line 269 of /var/www/office51/data/www/office-line86.ru/includes/lock.inc).</p><hr />