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 ('56050cca2e7b2615b7b9e563a1a21a1d', -1, 1711621218, 1711621218, '22e62367', -4, 0, 0)

Line : 187
File : sessions.php