phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8b9fa09dfb97bd1898f7a44d317983e3', -1, 1579230497, 1579230497, '641ab3c4', 0, 0, 0)

Line : 172
File : sessions.php