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 ('e1ec2e675c7b97b2d8dfd8d5532a53dc', -1, 1713901979, 1713901979, '0395fb9b', -6, 0, 0)

Line : 187
File : sessions.php