phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('1348694a84a544b57f7a86faf2e7253d', -1, 1634591803, 1634591803, '03eee858', -4, 0, 0)

Line : 187
File : sessions.php