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java.lang.NullPointerException: 	at hr.tosapinaetfos.quizmaker.RegisterActivity.isEmpty(RegisterActivity.java:72)	at hr.tosapinaetfos.quizmaker.RegisterActivity.registerOnclick(RegisterActivity.java:58)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)	at android.view.View.performClick(View.java:4084)	at android.view.View$PerformClick.run(View.java:16966)	at android.os.Handler.handleCallback(Handler.java:615)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:4745)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)