java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.io.File.isDirectory()' on a null object reference

[alexeyvasilyev]

Model Name: SONY Xperia XZ1 Compact
Android Version: Android 8.0

FATAL EXCEPTION: ControllerMessenger
Process: com.alexvas.dvr, PID: 14551
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.io.File.isDirectory()' on a null object reference
	at com.github.angads25.filepicker.view.FilePickerDialog.onStart(FilePickerDialog.java:224)
	at android.app.Dialog.show(Dialog.java:310)
	at com.github.angads25.filepicker.view.FilePickerDialog.show(FilePickerDialog.java:417)
	at com.alexvas.dvr.fragment.ManageCamerasFragment.lambda$showExportLocalStorageDialogImpl$13(ManageCamerasFragment.java:1096)
	at com.alexvas.dvr.g.e.lambda$XcjMa5MoPpkU5F-bh3jjIR43Ehs(Unknown Source:0)
	at com.alexvas.dvr.g.-$$Lambda$e$XcjMa5MoPpkU5F-bh3jjIR43Ehs.onClick(Unknown Source:6)
	at android.view.View.performClick(View.java:6256)
	at android.view.View$PerformClick.run(View.java:24701)
	at android.os.Handler.handleCallback(Handler.java:789)
	at android.os.Handler.dispatchMessage(Handler.java:98)
	at androidx.test.espresso.base.Interrogator.a(Interrogator.java:19)
	at androidx.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:164)
	at androidx.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:156)
	at androidx.test.espresso.base.UiControllerImpl.a(UiControllerImpl.java:34)
	at androidx.test.espresso.action.MotionEvents.a(MotionEvents.java:75)
	at androidx.test.espresso.action.MotionEvents.a(MotionEvents.java:50)
	at androidx.test.espresso.action.Tap.c(Tap.java:9)
	at androidx.test.espresso.action.Tap.a(Tap.java:19)
	at androidx.test.espresso.action.Tap$1.b(Tap.java:2)
	at androidx.test.espresso.action.GeneralClickAction.perform(GeneralClickAction.java:22)
	at androidx.test.espresso.ViewInteraction$SingleExecutionViewAction.perform(ViewInteraction.java:9)
	at androidx.test.espresso.ViewInteraction.a(ViewInteraction.java:78)
	at androidx.test.espresso.ViewInteraction.a(ViewInteraction.java:94)
	at androidx.test.espresso.ViewInteraction$1.call(ViewInteraction.java:3)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at android.os.Handler.handleCallback(Handler.java:789)
	at android.os.Handler.dispatchMessage(Handler.java:98)
	at android.os.Looper.loop(Looper.java:251)
	at android.app.ActivityThread.main(ActivityThread.java:6572)
	at java.lang.reflect.Method.invoke(Method.java)
	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)