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 ('dec2e1421485ec93f65f6fd33ccf4191', -1, 1713991512, 1713991512, '12756b5a', -4, 0, 0)

Line : 187
File : sessions.php