Index: /trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java	(revision 10422)
+++ /trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java	(revision 10423)
@@ -1267,5 +1267,5 @@
 
         private boolean insane() {
-            return size() > tileCache.getCacheSize();
+            return tileCache == null || size() > tileCache.getCacheSize();
         }