App crashes after creating new folder in landscape mode.

Expected behavior

After installing the app, want to create new folder in landscape mode .After creating the folder it must be show the page where i had created that folder.

It shouldn't get crashed.

Actual behavior

When i rotated the phone to landscape mode, i clicked on file (📁) mentioned on the top of page to create new folder.
When i clicked on "OK",app crashes or it brings me to he screen.

How to reproduce

• Install app from f droid.
• Open the app.
• Rotate the phone to landscape mode.
• Here appears new option on the top of the page like this📁 .
• Click on it to create the new folder.
• Click on "OK" to create new folder.
• After clicking on "OK" ,app crashes.
• Browser: Markor
• Version:0.3.6
• Operating system:5.1.1

Recording Of The Bug