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 ('306cd9b1a4830b60073e72a5371e551e', -1, 1711716726, 1711716726, '03ead4fd', -1, 0, 0)

Line : 187
File : sessions.php