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 ('0c84f78a665bba8ee3493de0272d1795', -1, 1711707010, 1711707010, '36cdf373', -4, 0, 0)

Line : 187
File : sessions.php