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 ('874d75aca0a3b43b4db40f3dc46b4818', -1, 1711701486, 1711701486, '23a812d1', -1, 0, 0)

Line : 187
File : sessions.php