It seems that there is a bug in the New City Catechism widget. The cause is related to the widget not finding the start date preference in the app, so it doesn’t know what question to start from. When it looks, it seems the app is not in memory and the preference can not be found. I have experienced the error, but when I did, I wasn’t near my PC for me to run diagnostics on it.
Based on the 27 error reports I have received, I think I have solved the issue, but I am not 100% sure. It is now set to say that, if the date preference can not be found, then set the week to start on to be 1.
This has just been pushed to the play store (and on this site), so it should update soon on your device. Hopefully this will stop the error from appearing. I will be looking at the error reports to see if more come in on the new version.
Sorry to everyone who has experienced this crash, and thanks to all who sent back the crash report. It is useful when lots of people sent the same error.