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 ('dbc0510c9a3fddd86ea7996ef9b84e95', -1, 1580092668, 1580092668, '641ab3c4', -4, 0, 0)

Line : 187
File : sessions.php