diff --git a/src/Mod/Part/App/Attacher.cpp b/src/Mod/Part/App/Attacher.cpp
index 0fcd21866..bc2833098 100644
--- a/src/Mod/Part/App/Attacher.cpp
+++ b/src/Mod/Part/App/Attacher.cpp
@@ -351,6 +351,9 @@ void AttachEngine::EnableAllSupportedModes()
 
 eRefType AttachEngine::getShapeType(const TopoDS_Shape& sh)
 {
+    if(sh.IsNull())
+        return rtAnything;
+    
     switch (sh.ShapeType()){
     case TopAbs_SHAPE:
         return rtAnything; //note: there's no rtPart detection here - not enough data!