QThread: Destroyed while thread is still running

This error message is typically seen in applications that use QThread, which is a Qt class for managing threads in a cross-platform way. The error message suggests that the QThread object has been destroyed while the thread is still running.

This can happen when the thread is not properly terminated before the QThread object is destroyed. It is important to ensure that the thread is stopped and cleaned up before the QThread object is deleted.

To avoid this error, you should ensure that your thread has finished its work and has been properly cleaned up before destroying the QThread object. This can be achieved by using signals and slots to communicate with the thread and to request it to stop its work, and by properly handling the thread's exit signal to ensure that it has been terminated before the QThread object is destroyed.

Additionally, you can use QThread::wait() to block the main thread until the thread has finished its work and has been properly cleaned up. This ensures that the thread is fully terminated before the QThread object is destroyed.

In summary, to avoid this error, you should ensure that the thread is properly terminated and cleaned up before the QThread object is destroyed. Proper handling of signals, slots, and the thread's exit signal can help ensure that the thread is properly terminated, and using QThread::wait() can help ensure that the thread is fully terminated before the QThread object is destroyed.