While QGIS developers do their best to make every QGIS release as stable as possible, sometimes you may encounter bugs or even crashes. To get them fixed in the future, it is necessary to inform the developers about issues.
This recipe shows you how to perform basic debugging and collect information that will help developers understand the problem better and help to fix it.
As the QGIS development process is very quick, bugs that are present in older versions are very likely already fixed in the latest version. So, it is necessary to ensure that you have the most recent QGIS version. If you use the development version of QGIS (so called "nightly" builds), upgrade to the last available build. If you prefer stable releases, then ensure that you have the latest stable version.