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Attempt to invoke virtual method 'byte[] java.lang.String.getBytes()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'byte[] java.lang.String.getBytes()' on a null object reference	at org.kontalk.util.MessageUtils.sha1(MessageUtils.java:206)	at org.kontalk.ui.NumberValidation.startImport(NumberValidation.java:763)	at org.kontalk.ui.NumberValidation.access$400(NumberValidation.java:113)	at org.kontalk.ui.NumberValidation$6.onInput(NumberValidation.java:673)	at com.afollestad.materialdialogs.MaterialDialog.onClick(MaterialDialog.java:370)	at android.view.View.performClick(View.java:5204)	at android.view.View$PerformClick.run(View.java:21153)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)