PyqtgraphViewer not working with new pyqtgraph/PyQt5 version

[MarcusZuber]

With the newest version of pyqtgraph and PyQt5 I get this error, when using

Traceback (most recent call last):
File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
self.run()
File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File "/usr/local/lib/python3.8/dist-packages/concert/ext/viewers.py", line 490, in run
app = pg.QtGui.QApplication([])
AttributeError: module 'pyqtgraph.Qt.QtGui' has no attribute 'QApplication'

When I switched to PyQt5-5.14.1 and pyqtgraph-0.12.1 everything worked again.

I think this is a problem within pyqtgraph. I will check this soon.