java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference
	at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:227)
	at android.app.AlertDialog.<init>(AlertDialog.java:204)
	at android.app.AlertDialog.<init>(AlertDialog.java:200)
	at android.app.AlertDialog.<init>(AlertDialog.java:145)
	at android.app.ProgressDialog.<init>(ProgressDialog.java:99)
	at com.entitcs.office_attendance.fragments.SelfieTaken.save_data_into_offline_mode(SelfieTaken.java:1847)
	at com.entitcs.office_attendance.fragments.SelfieTaken$22.onErrorResponse(SelfieTaken.java:1749)
	at com.android.volley.Request.deliverError(Request.java:617)
	at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:104)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:255)
	at android.app.ActivityThread.main(ActivityThread.java:8212)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)