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Calculation stops when using QMessageBox -> critical()

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Hello, in my programm I use a QMessageBox to display an Error (when closing the application while (Real-Time- ) calculation runs). Now I have the problem, that the calculation stops until the QMessageBox is closed. This is my code: if (this->communicate) {         QMessageBox messageBox;         messageBox.critical(0, "Warning", "Still communicating!");         messageBox.setFixedSize(500, 200);         event->ignore(); } Is there a way to let my Programm continue its calculation while the QMessageBox is open? Greetings, Matt

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