App crashed after additional servicing app is downloaded!

Expected behavior

App was supposed to work after additional servicing app is downloaded to the app.

Actual behavior

App crashed after the additional servicing app is downloaded to it.

How to reproduce

Download the app from f-driod

Launch the app

Open the app, and as per given instruction, download additional app to it.

And note the app crash bug

• Browser: OpenNoteScanner version 1.0.30
• Operating system: Andriod 7.0

Recording Of The Bug