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 ('f8ebeccc3e9ac61b9c3e4f5897ad1694', -1, 1713400304, 1713400304, '038a7811', -4, 0, 0)

Line : 187
File : sessions.php