Uncaught exception thrown in session handler.

PDOException: SQLSTATE[HY000]: General error: 1114 The table 'sessions' is full: INSERT INTO {sessions} (sid, ssid, uid, cache, hostname, session, 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); Array ( [:db_insert_placeholder_0] => L0twFPQvH3jc3dvcS1rGKQH71grcGWerq9i_6eL_JfQ [:db_insert_placeholder_1] => [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => 54.156.39.245 [:db_insert_placeholder_5] => messages|a:1:{s:5:"error";a:16:{i:0;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:1;s:30:"Tiedoston luonti epäonnistui.";i:2;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:3;s:30:"Tiedoston luonti epäonnistui.";i:4;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:5;s:30:"Tiedoston luonti epäonnistui.";i:6;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:7;s:30:"Tiedoston luonti epäonnistui.";i:8;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:9;s:30:"Tiedoston luonti epäonnistui.";i:10;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:11;s:30:"Tiedoston luonti epäonnistui.";i:12;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:13;s:30:"Tiedoston luonti epäonnistui.";i:14;s:265:"<em class="placeholder">Warning</em>: file_put_contents(): Filename cannot be empty funktiossa <em class="placeholder">file_unmanaged_save_data()</em> (rivi <em class="placeholder">1962</em> tiedostossa <em class="placeholder">/var/www/html/includes/file.inc</em>).";i:15;s:30:"Tiedoston luonti epäonnistui.";}} [:db_insert_placeholder_6] => 1540057388 ) in _drupal_session_write() (line 209 of /var/www/html/includes/session.inc).