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 ('6e979c85fc3e9ae4ef4ff1aca6ed3ea0', -1, 1713580460, 1713580460, '03914a36', -4, 0, 0)

Line : 187
File : sessions.php