Document.save returns a "javaNull" exception and save a zero byte pdf

Hello, with the “aspose-words-20.1-jdk17.jar” , I can’t convert a particular docx to pdf.
during the “document.save” it returns a “javaNull” exception and save a zero byte pdf.
With other docx it works, however we don’t understand what difference there might be.
We tried to convert that docx with your online version and it works.

Many thanks.

@865583 Could you please attach the problematic document here for testing? We will check the issue and provide you more information.

CC_FID.docx (76.9 KB)

Ciao, questo è il documento

@865583 Thank you for additional information. I cannot reproduce the problem using the latest 21.11 version of Aspose.Words for Java. So, please try using the latest version.
Also I have checked older versions of Aspose.Words for Java and the problem is not reproducible starting from 20.7 version of Aspose.Words for Java.