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 ('d70c5f22ba330110656b0e386aa820e3', -1, 1711712314, 1711712314, '035148f7', 6, 0, 0)

Line : 187
File : sessions.php