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 ('1dc79e83e989cf462085ce7be0122ea9', -1, 1711619141, 1711619141, 'ae813bc6', 5, 0, 0)

Line : 187
File : sessions.php