Index: /applications/editors/josm/plugins/FixAddresses/src/org/openstreetmap/josm/plugins/fixAddresses/OsmUtils.java
===================================================================
--- /applications/editors/josm/plugins/FixAddresses/src/org/openstreetmap/josm/plugins/fixAddresses/OsmUtils.java	(revision 24170)
+++ /applications/editors/josm/plugins/FixAddresses/src/org/openstreetmap/josm/plugins/fixAddresses/OsmUtils.java	(revision 24171)
@@ -23,4 +23,5 @@
 import org.openstreetmap.josm.data.osm.RelationMember;
 import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.tools.CheckParameterUtil;
 import org.openstreetmap.josm.tools.Pair;
 
@@ -67,4 +68,8 @@
 	 */
 	private static double findMinimum(LatLon a, LatLon b, LatLon c) {
+		CheckParameterUtil.ensureParameterNotNull(c, "c");
+		CheckParameterUtil.ensureParameterNotNull(b, "b");
+		CheckParameterUtil.ensureParameterNotNull(a, "a");
+		
 		LatLon mid = new LatLon((a.lat() + b.lat()) / 2, (a.lon() + b.lon()) / 2);