Android : location manager removeUpdates NPE

I have a non activity class MyLocation searching for location which is called form MainActivity. When MainActivity is onPause() I want to remove updates but I get an NPE because the listener = null even it's running. I know I can catch the NPE with an if but my problem is why the listener is null.

I'm calling in the MainActivity @ onPause():

MyLocation myLocation = new MyLocation(MainActivity.this, this);
myLocation.removeListener();

In MyLocation I start the location manager and want to stop listening with the method removeListener():

public boolean getLocation(Context context, LocationResult result) {
    // I use LocationResult callback class to pass location value from
    // MyLocation to user code.
    locationResult = result;
    if (lm == null)
        lm = (LocationManager) context
        .getSystemService(Context.LOCATION_SERVICE);

    // exceptions will be thrown if provider is not permitted.
    try {
        network_enabled = lm
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    } catch (Exception ex) {
    }
    try {
        gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
    } catch (Exception ex) {
    }

    // don't start listeners if no provider is enabled
    if (!gps_enabled && !network_enabled)
        enableLocationServices(context);

    if (network_enabled)
        lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
                locationListenerNetwork);

    if (gps_enabled)
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
                locationListenerGps);

    timer1 = new Timer();
    timer1.schedule(new GetLastLocation(), 60000);
    return true;
}

LocationListener locationListenerNetwork = new LocationListener() {
    public void onLocationChanged(Location location) {
        // timer1.cancel();
        locationResult.gotLocation(location);

        ivnetwork = (ImageView) activity.findViewById(R.id.ivnetwork);
        ivgps = (ImageView) activity.findViewById(R.id.ivgps);

        ivnetwork.setImageResource(R.drawable.ic_network_selected);
        ivgps.setImageResource(R.drawable.ic_gps_default);

        lm.removeUpdates(this);
    }

    public void onProviderDisabled(String provider) {
    }

    public void onProviderEnabled(String provider) {
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
};

LocationListener locationListenerGps = new LocationListener() {
    public void onLocationChanged(Location location) {

        locationResult.gotLocation(location);

        ivnetwork = (ImageView) activity.findViewById(R.id.ivnetwork);
        ivgps = (ImageView) activity.findViewById(R.id.ivgps);

        ivgps.setImageResource(R.drawable.ic_gps_selected);
        ivnetwork.setImageResource(R.drawable.ic_network_default);

        lm.removeUpdates(this);
        lm.removeUpdates(locationListenerNetwork);
        timer1.cancel();

    }

    public void onProviderDisabled(String provider) {
    }

    public void onProviderEnabled(String provider) {
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
};

public void removeListener () {
    timer1.cancel();
    lm.removeUpdates(locationListenerGps);
    lm.removeUpdates(locationListenerNetwork);
}

And here's my gotLocation() from MainActivity which calls a method to show the location:

 LocationResult locationResult = new LocationResult() {
 @Override
 public void gotLocation(Location location) {
     if (location == null){
         tvcity.setText(R.string.notfound);
     }       
     if (location != null) {
         setLocation(location);
     }
 }
 };

Here's the log:

10-08 14:16:22.805: W/dalvikvm(4939): threadid=1: thread exiting with uncaught  exception (group=0x40c87318)
10-08 14:16:22.805: E/AndroidRuntime(4939): FATAL EXCEPTION: main
10-08 14:16:22.805: E/AndroidRuntime(4939): java.lang.RuntimeException: Unable to pause activity {com.fleank.skybuddy/com.fleank.skybuddy.MainActivity}: java.lang.NullPointerException
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2842)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2798)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2776)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.access$800(ActivityThread.java:134)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.os.Looper.loop(Looper.java:137)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.main(ActivityThread.java:4744)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at java.lang.reflect.Method.invokeNative(Native Method)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at java.lang.reflect.Method.invoke(Method.java:511)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at dalvik.system.NativeStart.main(Native Method)
10-08 14:16:22.805: E/AndroidRuntime(4939): Caused by: java.lang.NullPointerException
10-08 14:16:22.805: E/AndroidRuntime(4939):     at com.fleank.skybuddy.MyLocation.removeListener(MyLocation.java:131)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at com.fleank.skybuddy.MainActivity.onPause(MainActivity.java:457)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.Activity.performPause(Activity.java:5106)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1225)
10-08 14:16:22.805: E/AndroidRuntime(4939):     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2829)