Index: trunk/src/org/openstreetmap/josm/actions/mapmode/SelectAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/mapmode/SelectAction.java	(revision 4037)
+++ trunk/src/org/openstreetmap/josm/actions/mapmode/SelectAction.java	(revision 4039)
@@ -163,4 +163,9 @@
         }
 
+        if( lastMousePos == null ) {
+            lastMousePos = e.getPoint();
+            return;
+        }
+
         if (!initialMoveThresholdExceeded) {
             int dxp = lastMousePos.x - e.getX();