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 ('54128c2ad7672f91f2998161af2fbd04', -1, 1713890358, 1713890358, '0311064b', -6, 0, 0)

Line : 187
File : sessions.php