Traceback (most recent call last):
File "/Applications/Frescobaldi.app/Contents/Resources/app/frescobaldi/document.py", line 259, in slotModificationChanged
app.documentModificationChanged(self)
File "/Applications/Frescobaldi.app/Contents/Resources/app/frescobaldi/signals.py", line 191, in emit
l.call(args, kwargs)
File "/Applications/Frescobaldi.app/Contents/Resources/app/frescobaldi/signals.py", line 306, in call
obj = self.obj()
^^^^^^^^^^
TypeError: 'NoneType' object is not callable

Optionally describe below what you were doing:

Frescobaldi: 4.0.2
Extension API: 0.9.0
Python: 3.12.7
python-ly: 0.9.9
Qt: 6.9.0
PyQt: 6.9.0
qpageview: 1.0.0
OS: macOS-15.4.1-arm64-arm-64bit
installation kind: standalone .app bundle