App crashes when synchronizing with Nextcloud

Hello, since the last update to 3.25.0 Opentodolist crashes each time i try to open it on my Android Smartphone (Android 7.1.1). I tried to reinstall it, but it crashes again, when i connect my Nextcloud (that works) and try to synchronize any library. So it seems to happen, when the app tries to synchronize with Nextcloud. From then on the app crashes at every start. I append some screenshots of Googles Crash Report.