App Crashes When Save As Pdf is clicked

Project Information

Repository:https://github.com/farmerbb/Notepad
Project Name: Notepad

Expected Behaviour:

When save as PDF is clicked on the application, it supposed to ask for location of where to save to and when selected, it should save.

Actual Behaviour: when save as PDF is clicked, the app closes immediately or it brings location of where to save to then closes.

How to Reproduce:

Download and Install the app from F-droid
Launch the application
Click on a note
Then press the Icon at the top right corner
Click on Print
The save as PDF

• Device : Android version 6.0
• Notepad: Version 2.3

Recording of Bug:

Proof of Work: http:// github.com/phenzzy