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My application throws an exception when I install the apk on an existing version. These are the steps to reproduce my error: Install application (i.e. v1) and run it (no error found) Install the same apk or a new one (i.e. v2) with a minor update A NullReferenceException is thrown Install the same apk of #2 Everything works fine This is the exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.empystudio.cashflow/com.empystudio.cashflow.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) at android.app.ActivityThread.access$600(ActivityThread.java:130) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) at android.os.Handler.dispatchMessage(Handler.java:99) 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) Caused by: java.lang.NullPointerException at com.empystudio.cashflow.MainActivity.onCreate(MainActivity.java:66) at android.app.Activity.performCreate(Activity.java:5008) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) ... 11 more This is the code of MainActivity @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); documentsView = (ImageView) findViewById(R.id.documents_view); backupView

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