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) VALUES ('7718c3b147062bbebc0ab14fc7243f11', -1, 1714714715, 1714714715, '03811687', 16, 0)

Line : 158
File : sessions.php