Index: /trunk/src/org/openstreetmap/josm/gui/MapView.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 19402)
+++ /trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 19403)
@@ -589,5 +589,6 @@
 
         nonChangedLayers.clear();
-        nonChangedLayers.addAll(visibleLayers.subList(0, nonChangedLayersCount));
+        if (nonChangedLayersCount > 0)
+            nonChangedLayers.addAll(visibleLayers.subList(0, nonChangedLayersCount));
         lastViewID = getViewID();
         lastClipBounds = g.getClipBounds();