The Quartus Prime software quit unexpectedly

Hi Po,

This is a real bug and hopefully you can provide a small test design that replicate the issue. For the private IP, you can blackbox it. You can reply email to me if don't want to attach it here.

Alternatively, you can keep your design files private for security reasons (confidential IPs), you can use the Quartus® II database to send someone your full compilation results without sending your source design files.

You may refer to KDB below on how to create a database without sharing your source code.

https://www.intel.com/content/www/us/en/support/programmable/articles/000076181.html