Uncaught exception thrown in session handler.

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '0' for key 'uid': 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] => gy7Rlh0thiWHhYdh8Vih_Lz-0Ebz8W-VNtK9gI21nAE [:db_insert_placeholder_1] => gy7Rlh0thiWHhYdh8Vih_Lz-0Ebz8W-VNtK9gI21nAE [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => 3.239.117.1 [:db_insert_placeholder_5] => nodeviewcount_views_limit|a:1:{i:10130;O:8:"DateTime":3:{s:4:"date";s:26:"2023-03-27 13:41:25.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:15:"Europe/Helsinki";}} [:db_insert_placeholder_6] => 1679913685 ) in _drupal_session_write() (line 209 of /home/science/public_html/includes/session.inc).