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 ('c6c8c1be7f70c2fefe96a0c4f2d7d2da', -1, 1713504761, 1713504761, '12bfab14', -9, 0, 0)

Line : 187
File : sessions.php