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 ('e083c9063d7afa7ce47395d765914330', -1, 1711703736, 1711703736, '22ed4ba5', 0, 0, 0)

Line : 187
File : sessions.php