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 ('2d172c5b4b4b9e93eec564fd704fad74', -1, 1711699823, 1711699823, '22e76d17', -4, 0, 0)

Line : 187
File : sessions.php