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 ('fdf38e4cf7ccb39fe5c2de4cd1197e68', -1, 1711646791, 1711646791, '2cc8f92a', -7, 0, 0)

Line : 187
File : sessions.php