Apparently, any tries to access to non-existing project through an invalid slug causes NullPointerException.
To reproduce :
Click "Projects" at the menu
Click one of the Projects
Click one of the version of the projects
write some invalid things as a project slug on the url
Here is the error trace:
When the bug is fixed, I expect to be redirected to the "missing_entity" url and see a generic warning page that includes an invalid project and/or version slug instead of the error page.