I have a somewhat simple Qt program here.

When I run (Command-R) the project for debug in Qt Creator, the app starts as normal. However, when I click on the log in button, it crashes with the attached problem report (termination reason: segmentation fault), whereas it should've simply displayed a message box. A workaround is to simply run the app from Finder or Terminal. Also, no such issue exists when the project is built and run for release.

The same project runs and works perfectly under Qt Creator on Linux.

A similar issue has been discussed here.
 
The related code can be found in login_window.cpp. You need to install argon2 for the project to run.