Compare tool not working

[sbsoccermom]

Describe the bug
While trying to compare the results of a couple scans, I'm able to input the first file. When the second file in input, I get an error:

Version: 7.95
Traceback (most recent call last):
File "C:\Program Files (x86)\Nmap\zenmap\lib\python3.11\site-packages\zenmapGUI\DiffCompare.py", line 380, in check_ndiff_process
stderr = self.ndiff_process.stderr.read()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'read'

This is an unexpected error and so crash report window asks me to copy the report and send the bug report.

To Reproduce
Steps to reproduce the behavior, including window titles and command-line options.

1. input the first file to compare (.xml format)
2. input the second file to compare and it immediately has a problem.

Expected behavior
A clear and concise description of what you expected to happen.
I expected it see a new document showing me the differences and similarities of the two files.

Version info (please complete the following information):

• OS: Windows 10 Home 22H2 build 19045.4529
• Zenmap version 7.95
• Output of nmap --version:

Additional context
Add any other context about the problem here, such as special network type.