Android. Floor Plans. App crashes if change order of images

[danylopidhainyi23]

Device: Samsung Galaxy S3, OS 4.3

STR:

1. Open Floor Plans on device
2. On CMS add new image or change order of existing
3. Hide app to background
4. Restore it

Actual: Crash

Crash log attached:
12-01 13:08:54.420: E/AndroidRuntime(10861): FATAL EXCEPTION: main
12-01 13:08:54.420: E/AndroidRuntime(10861): java.lang.NullPointerException: imageSource must not be null
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView.setImage(SubsamplingScaleImageView.java:402)
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView.setImage(SubsamplingScaleImageView.java:359)
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.connfa.ui.fragment.FloorPlanFragment$LoadPlanImageTask.onPostExecute(FloorPlanFragment.java:147)
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.connfa.ui.fragment.FloorPlanFragment$LoadPlanImageTask.onPostExecute(FloorPlanFragment.java:119)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.os.AsyncTask.finish(AsyncTask.java:631)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.os.Handler.dispatchMessage(Handler.java:99)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.os.Looper.loop(Looper.java:176)
12-01 13:08:54.420: E/AndroidRuntime(10861): at android.app.ActivityThread.main(ActivityThread.java:5419)
12-01 13:08:54.420: E/AndroidRuntime(10861): at java.lang.reflect.Method.invokeNative(Native Method)
12-01 13:08:54.420: E/AndroidRuntime(10861): at java.lang.reflect.Method.invoke(Method.java:525)
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
12-01 13:08:54.420: E/AndroidRuntime(10861): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
12-01 13:08:54.420: E/AndroidRuntime(10861): at dalvik.system.NativeStart.main(Native Method)