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 ('476fc629ac381eed2b7d8ed0caf73b95', -1, 1711695683, 1711695683, '36f216f7', -4, 0, 0)

Line : 187
File : sessions.php