From 35168039c055b01b75dcefeb02e6f80dd9bfc6b3 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Tue, 23 Sep 2014 15:31:52 +0400
Subject: [PATCH] Avoid crash on Length constraint with value equal to 0

---
 src/SketchSolver/SketchSolver_Constraint.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/SketchSolver/SketchSolver_Constraint.cpp b/src/SketchSolver/SketchSolver_Constraint.cpp
index d5f1e6810..19af99788 100644
--- a/src/SketchSolver/SketchSolver_Constraint.cpp
+++ b/src/SketchSolver/SketchSolver_Constraint.cpp
@@ -190,7 +190,7 @@ AttrType typeOfAttribute(boost::shared_ptr<ModelAPI_Attribute> theAttribute)
   if (anAttrRef->isObject()) {
     ResultConstructionPtr aRC = boost::dynamic_pointer_cast<ModelAPI_ResultConstruction>(
         anAttrRef->object());
-    if (!aRC)
+    if (!aRC || !aRC->shape())
       return UNKNOWN;
 
     if (aRC->shape()->isVertex())
-- 
2.39.2