App crashes while using some features

Expected behavior

I expect the app to function well without some features crashing the app

Actual behavior

App crashes while using the love symbol or probably a favorite button on the open document reader app

How to reproduce

• Download the app from Fdroid

• Add any file format preferably PDF file using the add file icon, allow it to load the document so that it can be readable by the app

• click the love symbol icon, choose Tue second the option and choose document.odt, continue by pressing ok, it'll load and crash

• Browser: Opendocument Reader version 2.16
• Operating system: Android 7.0

Recording Of The Bug