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 ('755a61b8c0557a4b2169986e3330d0fb', -1, 1713508079, 1713508079, '038e8756', -9, 0, 0)

Line : 187
File : sessions.php