Describe the bug

When converting CGNS meshes to SU2 format using SU2_DEF using the Windows binaries, the executable crashes and gives a segmentation fault. This has been reported on Slack and by students using SU2 for CFD course assignments. I couldn't reproduce the bug compiling from source on any of my machines (Linux/Mac), but I don't have a Windows build to test on currently.

Bug report checklist

• Consulting the build instructions (https://su2code.github.io/docs_v7/Build-SU2-Linux-MacOS/).
• Looking for similar problems on GitHub or CFD-Online (https://www.cfd-online.com/Forums/su2/).
• Updating to the newest version of SU2 (either develop, master, or the pre-built executables https://su2code.github.io/download.html).

Desktop (please complete the following information):

• OS: [Windows]
• C++ compiler and version: [N/A]
• MPI implementation and version: [N/A]
• SU2 Version: [v8.4.0]