NullPointerException in DialogPreferenceMapsListAdapter

[seg-ha]

E/AndroidRuntime(20634): FATAL EXCEPTION: main
E/AndroidRuntime(20634): Process: org.openbmap, PID: 20634
E/AndroidRuntime(20634): java.lang.NullPointerException
E/AndroidRuntime(20634): at org.openbmap.activities.DialogPreferenceMapsListAdapter.getGroupView(DialogPreferenceMapsListAdapter.java:117)
E/AndroidRuntime(20634): at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:446)
E/AndroidRuntime(20634): at android.widget.AbsListView.obtainView(AbsListView.java:2255)
E/AndroidRuntime(20634): at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
E/AndroidRuntime(20634): at android.widget.ListView.onMeasure(ListView.java:1175)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
E/AndroidRuntime(20634): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
E/AndroidRuntime(20634): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
E/AndroidRuntime(20634): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
E/AndroidRuntime(20634): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
E/AndroidRuntime(20634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime(20634): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
E/AndroidRuntime(20634): at android.view.View.measure(View.java:16497)
E/AndroidRuntime(20634): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912)
E/AndroidRuntime(20634): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1084)
E/AndroidRuntime(20634): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
E/AndroidRuntime(20634): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
E/AndroidRuntime(20634): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
E/AndroidRuntime(20634): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
E/AndroidRuntime(20634): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
E/AndroidRuntime(20634): at android.view.Choreographer.doFrame(Choreographer.java:544)
E/AndroidRuntime(20634): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
E/AndroidRuntime(20634): at android.os.Handler.handleCallback(Handler.java:733)
E/AndroidRuntime(20634): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(20634): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(20634): at android.app.ActivityThread.main(ActivityThread.java:5001)
E/AndroidRuntime(20634): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(20634): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(20634): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
E/AndroidRuntime(20634): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
E/AndroidRuntime(20634): at dalvik.system.NativeStart.main(Native Method)