Index: trunk/src/org/openstreetmap/josm/data/validation/tests/MapCSSTagChecker.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/MapCSSTagChecker.java	(revision 14537)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/MapCSSTagChecker.java	(revision 14540)
@@ -993,5 +993,5 @@
                 .map(e -> ((LiteralExpression) e).getLiteral())
                 .filter(l -> l instanceof String)
-                .map(l -> (String) l)
+                .map(l -> ((String) l).split(",")[0])
                 .findFirst();
     }