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 ('e29e28a2c3043ff763954f3d4eee2a39', -1, 1638371134, 1638371134, '369efb68', -4, 0, 0)

Line : 187
File : sessions.php