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) VALUES ('e02b5b87b47b0d31dc9ec77c8337a7ad', -1, 1563258031, 1563258031, '36a2974d', -4, 0)

Line : 158
File : sessions.php