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 ('52f871a49150a7b3b484b50003b03bc6', -1, 1571222339, 1571222339, '22ccbf1f', 0, 0, 0)

Line : 191
File : sessions.php