Index: trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 12167)
+++ trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 12168)
@@ -624,4 +624,5 @@
             for (WayPoint trkPnt : visibleSegments) {
                 if (!trkPnt.isLatLonKnown()) {
+                    old = null;
                     continue;
                 }
@@ -652,4 +653,5 @@
             for (WayPoint trkPnt : visibleSegments) {
                 if (!trkPnt.isLatLonKnown()) {
+                    old = null;
                     continue;
                 }