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 ('eeb0964e7f2ebd61f0e0f6fd7cfa8517', -1, 1711696844, 1711696844, '03e737f3', -4, 0, 0)

Line : 187
File : sessions.php