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 ('81c94f7d1a6ebf78769fd29654c6f8f8', -1, 1714038997, 1714038997, '0311a2f7', 5, 0, 0)

Line : 187
File : sessions.php