[v1.6.3] TypeError - /usr/lib/python3/dist-packages/OpenNumismat/SettingsDialog.py:87

OpenNumismat: 1.6.3
OS: Linux 4.13.0-16-generic (#19-Ubuntu SMP Wed Oct 11 18:33:49 UTC 2017)
Python: 3.6.3 (32bit)
Qt: 5.7
Locale: es

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/OpenNumismat/MainWindow.py", line 371, in settingsEvent
dialog = SettingsDialog(self.collection, self)
File "/usr/lib/python3/dist-packages/OpenNumismat/Tools/DialogDecorators.py", line 10, in __init__
orig_init(self, *args, **kws) # call the original __init__
File "/usr/lib/python3/dist-packages/OpenNumismat/SettingsDialog.py", line 280, in __init__
mainPage = MainSettingsPage(collection, self)
File "/usr/lib/python3/dist-packages/OpenNumismat/SettingsDialog.py", line 87, in __init__
self.speedup.setCurrentIndex(settings['speedup'])
TypeError: setCurrentIndex(self, int): argument 1 has unexpected type 'str'