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 ('f8c6f5b533868f3a38b574b6cbea79c6', -1, 1714033278, 1714033278, '12e11f9f', -4, 0, 0)

Line : 187
File : sessions.php