From 578a48b785466b2f4544fbc346a97b3984ed5f5a Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Tue, 30 Oct 2018 13:37:10 +0300
Subject: [PATCH] Issue #2720: Fatal error when create arc

Avoid crash on creation of arc with equal center and start points.
---
 src/SketchPlugin/SketchPlugin_MacroArc.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/SketchPlugin/SketchPlugin_MacroArc.cpp b/src/SketchPlugin/SketchPlugin_MacroArc.cpp
index b6a09bde6..8860e4f32 100644
--- a/src/SketchPlugin/SketchPlugin_MacroArc.cpp
+++ b/src/SketchPlugin/SketchPlugin_MacroArc.cpp
@@ -491,6 +491,9 @@ void SketchPlugin_MacroArc::fillByCenterAndTwoPassed()
     return;
 
   GeomAPI_Circ2d aCircleForArc(myCenter, myStart);
+  // avoid degerated arc, when the center and the start points are equal
+  if (!aCircleForArc.implPtr<void*>())
+    return;
 
   bool aWasBlocked = data()->blockSendAttributeUpdated(true);
   // check the end point is referred to another feature
-- 
2.39.2