Hello,
We observed multiple NullReferenceExceptions when extracting from different files and would be happy when you fix them To make GroupDocs.Search more reliable.
1. .doc file
at \u0006\u001A\u0018\u0015.\u0008()…...one file at \u0008\u0015\u0017.\u0002()...the files (like text, some images, diagrams, some embedded objects...