Index: src/org/openstreetmap/josm/plugins/buildings_tools/DrawBuildingAction.java
===================================================================
--- src/org/openstreetmap/josm/plugins/buildings_tools/DrawBuildingAction.java	(revision 35817)
+++ src/org/openstreetmap/josm/plugins/buildings_tools/DrawBuildingAction.java	(working copy)
@@ -263,6 +263,8 @@
 
     private Mode modeDrawingWidth() {
         building.setWidth(getEastNorth());
+        if (building.getWidth() <= 1E-7)
+            return Mode.Drawing;
         MainApplication.getMap().statusLine.setDist(Math.abs(building.getWidth()));
         return Mode.None;
     }