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 ('2ea9fd4d8605f526cbed00bb8e1cc8e7', -1, 1711720840, 1711720840, '36500ba0', -7, 0, 0)

Line : 187
File : sessions.php