java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)	at java.util.HashMap$KeyIterator.next(HashMap.java:814)	at java.util.AbstractCollection.toArrayList(AbstractCollection.java:349)	at java.util.AbstractCollection.toArray(AbstractCollection.java:339)	at java.util.ArrayList.(ArrayList.java:97)	at cgeo.geocaching.maps.mapsforge.v6.caches.GeoitemLayers.getGeocodes(GeoitemLayers.java:17)	at cgeo.geocaching.maps.mapsforge.v6.caches.AbstractCachesOverlay.getGeocodes(AbstractCachesOverlay.java:169)	at cgeo.geocaching.maps.mapsforge.v6.caches.AbstractCachesOverlay.getVisibleItemsCount(AbstractCachesOverlay.java:54)	at cgeo.geocaching.maps.mapsforge.v6.caches.CachesBundle.getVisibleItemsCount(CachesBundle.java:159)	at cgeo.geocaching.maps.mapsforge.v6.NewMap.countVisibleCaches(NewMap.java:872)	at cgeo.geocaching.maps.mapsforge.v6.NewMap.calculateSubtitle(NewMap.java:852)	at cgeo.geocaching.maps.mapsforge.v6.NewMap.setSubtitle(NewMap.java:832)	at cgeo.geocaching.maps.mapsforge.v6.NewMap.access$300(NewMap.java:99)	at cgeo.geocaching.maps.mapsforge.v6.NewMap$DisplayHandler.handleMessage(NewMap.java:795)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:211)	at android.app.ActivityThread.main(ActivityThread.java:5373)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)