phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b36e461b63f3844eff4cdc7d14391007', -1, 1539731153, 1539731153, '365ca369', -1, 0, 0)

Line : 187
File : sessions.php