App crashes while trying to go back to the root folder after locking and unlocking the phone

Expected behavior

I expected the app to go back to the root folder successfully without crashing when I check the app info, lock and unlock the phone and then click on the root folder, all while the screen is in landscape view.

Actual behavior

When I launch the app and rotate the screen to landscape view, then navigate to a file,view the file info, lock and unlock the phone then click on the root folder. The app goes back to the root or parent folder and then crashes.

How to rreproduce

• Download the app from play store
• Launch the app
• Rotate the screen to landscape view
• From the Home Activity, click on the gallery option
• Click on any folder to view file
• Click on the 3 dots at the bottom right of the file
• Click on "Info "
• Lock the phone
• Unlock the phone
• Click on the spinner in the toolbar with the folder name
• From the drop down, click on the parent Activity
• App goes back to the parent Activity and then crashes.

• Version : Version 3.8
• Device : Gionee A1 Lite
• Operating system: Android 7.0

Recording Of The Bug