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 ('4f8b8c2ccf06bc6b6a1e5c19b81f7072', -1, 1711648691, 1711648691, 'ae813bc6', -1, 0, 0)

Line : 187
File : sessions.php