phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0' 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 ('4dd63e98b720f9230b36e8e3f92d5eb3', -1, 1542128657, 1542128657, '36eb306a', 0, 0, 0)

Line : 187
File : sessions.php