phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO docttorrdiscluc_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4d02c72c814da6895b98f064a76fd246', -1, 1574408344, 1574408344, '12cc3868', 1, 0, 0)

Line : 190
File : sessions.php