Obviously this should not happen, but sometimes it still does...
It could be MediaInfo itself, or your source file is problematic. You can try updating MediaInfo to the latest working version 18.5. The DLL is here:
https://www.sendspace.com/file/m4myu1
Just extract the DLL into your "AVStoDVD\Lib" folder.
Otherwise try to remux your source, maybe using a different container. If your source is a transport stream (extension TS, MTS, M2TS) then it is always a good idea to remux it into an MKV container (use MKVToolNix). The reason is that transport streams do not contain time stamps, but MKV streams do.
Good luck...