In case an app crashes and you are unable to utilise it, please disable System Integrity Protection as follows

Turn off your Mac (Apple > Shut Down).

Hold down Command-R and press the Power button. Keep holding Command-R until the Apple logo appears.

Wait for OS X to boot into the OS X Utilities window.

Choose Utilities > Terminal.

Enter csrutil enable

Enter reboot.

When macOS loads up normally please try working with the software as usual.