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 ('803d00df52f131f51e2db971f43d2730', -1, 1713911711, 1713911711, '0391240a', -9, 0, 0)

Line : 187
File : sessions.php