[jtx Board] Task sync causes NullPointerException

[rfc2822]

Discussed in #1264

^{Originally posted by CrystalMV13 January 25, 2025}
Hello, I have been using Davx5 for a bit, and it has been working great now, but I've identified an issue in syncing recurring tasks; syncing it throws a NullPointerException. I have attached the debug info and logcat (edited to remove my email address and calendar names). The important calendar is cal1. The bug begins only once the first task is marked as complete.

debug-info.txt
logcat.txt

Thank you in advance!

[rfc2822]

CC @patrickunterwegs