From 7c6fb179cda3b2f3a8489e416d54af7f93b361e6 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Mon, 31 Oct 2016 12:23:00 +0300
Subject: [PATCH] Protect "Multi" constraint if it already removed (issue
 #1790)

Do not update such constraint if it is in queue for remove.
---
 src/SketchSolver/SketchSolver_ConstraintMulti.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/SketchSolver/SketchSolver_ConstraintMulti.cpp b/src/SketchSolver/SketchSolver_ConstraintMulti.cpp
index df18477ed..0ee95310f 100644
--- a/src/SketchSolver/SketchSolver_ConstraintMulti.cpp
+++ b/src/SketchSolver/SketchSolver_ConstraintMulti.cpp
@@ -73,6 +73,8 @@ void SketchSolver_ConstraintMulti::update(bool isForce)
   AttributeRefListPtr anInitialRefList = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
       myBaseConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
   AttributeIntegerPtr aNbObjects = myBaseConstraint->integer(nameNbObjects());
+  if (!anInitialRefList || !aNbObjects)
+    return; // the "Multi" constraint is in queue to remove
   bool isUpdated= anInitialRefList->size() != myNumberOfObjects || aNbObjects->value()-1 != myNumberOfCopies;
   if (!isUpdated) {
     // additional check that the features and their copies are changed
-- 
2.39.2