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 ('56565cb0d532c533b11d245f40fb589b', -1, 1714001029, 1714001029, '0391ad70', 2, 0, 0)

Line : 187
File : sessions.php