Thanks. Please backup the database just to be safe, then run
delete from deletion where sync_id is null;
select count(*) from deletion where sync_id is null;
again to make sure the result is
This should fix the error.
This is a data inconsistency that was created by an old bug in the mobile app. This data issue was not critical and was not noticed before 1.3.1, but in 1.3.3 the code was changed in a way that requires this particular property to always be correct. It was not expected that some users might have this data issue, so the app crashed after the update. To make things worse, the error reporting service was malfunctioning in the last few weeks, so it looks like your reports got missing. Really sorry about that.