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 ('53a0544e2981a6fe9f6d579b549d8963', -1, 1537833597, 1537833597, '3650537b', -8, 0, 0)

Line : 187
File : sessions.php