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 ('6ae537937e1fbbbd6adb84f1c56ab855', -1, 1711709241, 1711709241, '03ecab44', -4, 0, 0)

Line : 187
File : sessions.php