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 ('a35deeb455914c16af7fc09c51e86ad5', -1, 1713979713, 1713979713, '12e095f2', -4, 0, 0)

Line : 187
File : sessions.php