From 8cadc422cc232613ce215e463276e29153d598e9 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Mon, 6 Apr 2015 14:58:19 +0300
Subject: [PATCH] Fix the crash while removing lines with coincident points

---
 src/SketchSolver/SketchSolver_ConstraintCoincidence.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/SketchSolver/SketchSolver_ConstraintCoincidence.cpp b/src/SketchSolver/SketchSolver_ConstraintCoincidence.cpp
index 52dc868ba..1172988cb 100644
--- a/src/SketchSolver/SketchSolver_ConstraintCoincidence.cpp
+++ b/src/SketchSolver/SketchSolver_ConstraintCoincidence.cpp
@@ -121,8 +121,12 @@ bool SketchSolver_ConstraintCoincidence::remove(ConstraintPtr theConstraint)
         break;
     if (aPos >= (int)myExtraCoincidence.size())
       return false; // there is no constraint, which is specified to remove
-    else
+    else {
+      bool isEmpty = anExtraIt->first == SLVS_E_UNKNOWN;
       myExtraCoincidence.erase(anExtraIt);
+      if (isEmpty)
+        return false;
+    }
   }
 
   bool isFullyRemoved = myStorage->removeConstraint(mySlvsConstraints[aPos+1]);
-- 
2.39.2