Cannot destroy QApplication singleton

I can't seem to destroy a QApplication instance using del operator or quit() using PySide2 5.14.0.

Here is a sample Python program to reproduce the issue:

import sys
from PySide2.QtWidgets import *

app = QApplication(sys.argv)
label = QLabel("Hello World")
label.show()
app.exec_()

del app

app = QApplication(sys.argv)
label = QLabel("Hello World")
label.show()
app.exec_()

sys.exit()

 I get an error saying:

"RuntimeError: Please destroy the QApplication singleton before creating a new QApplication instance."

PyQt5 works without an error using this same code.