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 ('3930f1c982acc51ed4ff780e4e2e6503', -1, 1714064006, 1714064006, '0a020003', -9, 0, 0)

Line : 187
File : sessions.php