Index: trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java	(revision 15924)
+++ trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java	(revision 15925)
@@ -725,6 +725,5 @@
 
         public static Range fromLevel(int a, int b) {
-            if (a > b)
-                throw new AssertionError();
+            // for input validation in Range constructor below
             double lower = 0;
             double upper = Double.POSITIVE_INFINITY;