Segfault due to reference counting when exiting Jupyter QtConsole

$ jupyter-qtconsole
Fatal Python error: deallocating None

Current thread 0x0000000101896340 (most recent call first):
Abort trap: 6

from PySide2 import QtWidgets

app_instance = QtWidgets.QApplication([])
# If this is commented, application doesn't crash on exit anymore.
app_instance2 = app_instance

w = QtWidgets.QMainWindow()
w.setWindowTitle('Hello World!')
w.resize(250, 150)
w.show()
app_instance.exec_()

frame #0: 0x00007fffcb80ad42 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fffcb8f8457 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x00007fffcb770420 libsystem_c.dylib`abort + 129
    frame #3: libpython3.5m.dylib`Py_FatalError(msg="deallocating None") at pylifecycle.c:1385
    frame #4: libpython3.5m.dylib`none_dealloc(ignore=0x000000010165ca38) at object.c:1372
    frame #5: libpython3.5m.dylib`insertdict(mp=0x000000010078dcc8, key=0x0000000106b053e8, hash=-5214649808865345009, value=0x00000001003212f8) at dictobject.c:809
    frame #6: libpython3.5m.dylib`PyDict_SetItem(op=0x000000010078dcc8, key=0x0000000106b053e8, value=0x00000001003212f8) at dictobject.c:1228
    frame #7: libpython3.5m.dylib`_PyModule_ClearDict(d=0x000000010078dcc8) at moduleobject.c:593
    frame #8: libpython3.5m.dylib`_PyModule_Clear(m=0x000000010077df48) at moduleobject.c:544
    frame #9: libpython3.5m.dylib`PyImport_Cleanup at import.c:460
    frame #10: libpython3.5m.dylib`Py_Finalize at pylifecycle.c:576
    frame #11: libpython3.5m.dylib`Py_Main(argc=2, argv=0x0000000100502b70) at main.c:788
    frame #12: python`main(argc=2, argv=0x00007fff5fbff260) at python.c:65
    frame #13: 0x00007fffcb6dc235 libdyld.dylib`start + 1