Index: applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TagChecker.java
===================================================================
--- applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TagChecker.java	(revision 19599)
+++ applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/TagChecker.java	(revision 19611)
@@ -338,6 +338,9 @@
                     {
                         TaggingPreset.Combo combo = (TaggingPreset.Combo) i;
-                        for(String value : combo.values.split(","))
-                            presetsValueData.add(combo.key, value);
+                        if(combo.values != null)
+                        {
+                            for(String value : combo.values.split(","))
+                                presetsValueData.add(combo.key, value);
+                        }
                     }
                     else if(i instanceof TaggingPreset.Key)