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: 2006 MySQL server has gone away: SELECT name, machine_name, vid FROM {taxonomy_vocabulary}; Array
(
)
 in taxonomy_vocabulary_get_names() (line 1002 of /web/www/pra/modules/taxonomy/taxonomy.module).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array
(
    [:db_insert_placeholder_0] =&amp;gt; 0
    [:db_insert_placeholder_1] =&amp;gt; php
    [:db_insert_placeholder_2] =&amp;gt; %type: !message in %function (line %line of %file).
    [:db_insert_placeholder_3] =&amp;gt; a:6:{s:5:&amp;quot;%type&amp;quot;;s:12:&amp;quot;PDOException&amp;quot;;s:8:&amp;quot;!message&amp;quot;;s:134:&amp;quot;SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT name, machine_name, vid FROM {taxonomy_vocabulary}; Array
(
)
&amp;quot;;s:9:&amp;quot;%function&amp;quot;;s:31:&amp;quot;taxonomy_vocabulary_get_names()&amp;quot;;s:5:&amp;quot;%file&amp;quot;;s:45:&amp;quot;/web/www/pra/modules/taxonomy/taxonomy.module&amp;quot;;s:5:&amp;quot;%line&amp;quot;;i:1002;s:14:&amp;quot;severity_level&amp;quot;;i:3;}
    [:db_insert_placeholder_4] =&amp;gt; 3
    [:db_insert_placeholder_5] =&amp;gt; 
    [:db_insert_placeholder_6] =&amp;gt; https://pralab.diee.unica.it/it/biblio?amp%3Bamp%3Bs=year&amp;amp;amp%3Bamp%3Bo=desc&amp;amp;amp%3Bamp%3Bf%5Bauthor%5D=57&amp;amp;amp%3Bf%5Bauthor%5D=450&amp;amp;f%5Bauthor%5D=513&amp;amp;s=type&amp;amp;o=desc
    [:db_insert_placeholder_7] =&amp;gt; 
    [:db_insert_placeholder_8] =&amp;gt; 192.168.1.6
    [:db_insert_placeholder_9] =&amp;gt; 1680106801
)
 in dblog_watchdog() (line 160 of /web/www/pra/modules/dblog/dblog.module).</p><hr />