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 ('d7487e171cb16e5f658dbd2ef2435a59', -1, 1711709739, 1711709739, '23a871f8', -10, 0, 0)

Line : 187
File : sessions.php