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 ('79fed6c6732ddd1830a8d377f64dfa3b', -1, 1709326493, 1709326493, '641ac4de', -4, 0, 0)

Line : 187
File : sessions.php