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 ('f2c7013a0a548cdce2c56bc3ec3d939a', -1, 1711722884, 1711722884, '36ac5f6a', -4, 0, 0)

Line : 187
File : sessions.php