IO loop going away before the audio device has been stopped

When i load html file in pyqt. This file is the simplest official guidance document, from Configure Blockly/Web/Fixed Size Workspace. The error occurred.

The heart code that i load file as below：
		self.view = QWebEngineView(self)
	        self.view.load(QUrl.fromLocalFile(this is FilePath))
		self.view.show()

Anyone else who can help me. Thanks!!