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 ('b8f05e8d9ccaf2e934b7f7da6b9ba2fb', -1, 1711726253, 1711726253, '2cc04944', -4, 0, 0)

Line : 187
File : sessions.php