Index: /trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java	(revision 14010)
+++ /trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java	(revision 14011)
@@ -1217,5 +1217,5 @@
 
     @Override
-    public void paint(Graphics2D g, MapView mv, Bounds box) {
+    public synchronized void paint(Graphics2D g, MapView mv, Bounds box) {
         // sanity checks
         MapView mapView = MainApplication.getMap().mapView;