Index: /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 8431)
+++ /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 8432)
@@ -283,5 +283,5 @@
                 } else if (c instanceof KeyValueCondition) {
                     KeyValueCondition keyValueCondition = (KeyValueCondition) c;
-                    if (!Op.NEGATED_OPS.contains(keyValueCondition)) {
+                    if (!Op.NEGATED_OPS.contains(keyValueCondition.op)) {
                         key = keyValueCondition.k;
                     }