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 ('92ffa949cccb80fe0ca2351683b084df', -1, 1711714798, 1711714798, '369d38b3', -7, 0, 0)

Line : 187
File : sessions.php