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 ('ff76ca2ca55fd6a9e8f9755c132cb5c3', -1, 1713571389, 1713571389, '0391821f', -4, 0, 0)

Line : 187
File : sessions.php