Android NPE in onSaveInstanceState

[binarybucks]

New NPE unearthed by @stylpen:

MainActivity.java:355 - st.alr.homA.MainActivity$DeviceFragment.onSaveInstanceState
Fragment.java:1607 - android.support.v4.app.Fragment.performSaveInstanceState
FragmentManager.java:1587 - android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState
FragmentManager.java:1655 - android.support.v4.app.FragmentManagerImpl.saveAllState
FragmentActivity.java:527 - android.support.v4.app.FragmentActivity.onSaveInstanceState
MainActivity.java:96 - st.alr.homA.MainActivity.onSaveInstanceState
Activity.java:1181 - android.app.Activity.performSaveInstanceState
Instrumentation.java:1230 - android.app.Instrumentation.callActivityOnSaveInstanceState
ActivityThread.java:3550 - android.app.ActivityThread.handleRelaunchActivity
ActivityThread.java:140 - android.app.ActivityThread.access$800
ActivityThread.java:1243 - android.app.ActivityThread$H.handleMessage
Handler.java:99 - android.os.Handler.dispatchMessage
Looper.java:137 - android.os.Looper.loop
ActivityThread.java:4921 - android.app.ActivityThread.main
Method.java:-2 - java.lang.reflect.Method.invokeNative
Method.java:511 - java.lang.reflect.Method.invoke
ZygoteInit.java:1027 - com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
ZygoteInit.java:794 - com.android.internal.os.ZygoteInit.main
NativeStart.java:-2 - dalvik.system.NativeStart.main