From fc88c49ff45f48d63ff6067384e56eb146c4cbc0 Mon Sep 17 00:00:00 2001
From: nds <nds@opencascade.com>
Date: Sat, 26 Dec 2015 21:16:36 +0300
Subject: [PATCH] Crash in solver in the following case:

1. Start sketch
2. Create a line
3. Start Fixed constraint
4. Select a point on the line. Apply
5. Select the line by rectangle
6. Delete button click
BUG: crash
---
 src/SketchSolver/SketchSolver_ConstraintFixed.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/SketchSolver/SketchSolver_ConstraintFixed.cpp b/src/SketchSolver/SketchSolver_ConstraintFixed.cpp
index 012a45423..ee1700d22 100644
--- a/src/SketchSolver/SketchSolver_ConstraintFixed.cpp
+++ b/src/SketchSolver/SketchSolver_ConstraintFixed.cpp
@@ -100,8 +100,10 @@ bool SketchSolver_ConstraintFixed::remove()
   if (myBaseConstraint && myFixedAttribute) {
     if (myFixedAttribute->isObject())
       aFeature = ModelAPI_Feature::feature(myFixedAttribute->object());
-    else
-      myStorage->update(AttributePtr(myFixedAttribute), myGroupID);
+    else {
+      if (myFixedAttribute->attr().get())
+        myStorage->update(AttributePtr(myFixedAttribute), myGroupID);
+    }
   }
   if (aFeature)
     myStorage->update(aFeature, myGroupID);
-- 
2.39.2