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 ('1972bc62cc2d99358924edc2187c2403', -1, 1711711919, 1711711919, '36a68d34', -10, 0, 0)

Line : 187
File : sessions.php