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 ('7b55f0350c88240c1b2ffdadade454ff', -1, 1542128640, 1542128640, '36eb306a', 74, 0, 0)

Line : 187
File : sessions.php