App forces stop after selecting all files.

Expected behavior

The app should unselect the files selected upon clicking the open screen but that does not happen in dir file manager.

Actual behavior

When you select all files in a particular folder and click anywhere on the screen after that, the app forces stop.

How to reproduce

• Long press on a file
• Click select all files
• In the meantime click anywhere on screen as it takes a lot of time to select all files.
• The application will crash.

• Browser: Google Chrome for Android 63.0.3239.111
• Operating system: Android 6.0.1

Recording Of The Bug