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 ('037871a1fd9b07cd7e3f6b64d83740f1', -1, 1730415829, 1730415829, '038ff732', -9, 0, 0)

Line : 195
File : sessions.php