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 ('5dea6fc215f295b5d901cc99465145cd', -1, 1711715813, 1711715813, '3698d8aa', -4, 0, 0)

Line : 187
File : sessions.php