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 ('0dc21c23919b4f495a45337d5ae9bcc8', -1, 1711655889, 1711655889, '03e792ac', 6, 0, 0)

Line : 187
File : sessions.php