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 ('d4f5b98a9764431ae8c296e747b05474', -1, 1711643875, 1711643875, '035acda6', -2, 0, 0)

Line : 187
File : sessions.php