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 ('dc6859de96f2d49953de5c2b6aeb3f53', -1, 1552955515, 1552955515, '365acce9', 1, 0, 0)

Line : 187
File : sessions.php