From: azv <azv@opencascade.com>
Date: Thu, 28 Feb 2019 09:51:35 +0000 (+0300)
Subject: Issue #2880: SIGSEGV after undo an arc deletion
X-Git-Tag: HighLevelObjectsHierarchy~5
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=13bf3ed561d8d6b91406b44fd6407cd4257741c9;p=modules%2Fshaper.git

Issue #2880: SIGSEGV after undo an arc deletion

Avoid crash while getting the position of tangency presentation.
---

diff --git a/src/SketcherPrs/SketcherPrs_PositionMgr.cpp b/src/SketcherPrs/SketcherPrs_PositionMgr.cpp
index 167066152..d98ffa0ac 100644
--- a/src/SketcherPrs/SketcherPrs_PositionMgr.cpp
+++ b/src/SketcherPrs/SketcherPrs_PositionMgr.cpp
@@ -150,14 +150,17 @@ const std::array<int, 2>& SketcherPrs_PositionMgr::getPositionIndex(GeomPointPtr
       if (aUseFeature) {
         DataPtr aData = aFeature->data();
         AttributeRefAttrPtr aObjRef = aData->refattr(SketchPlugin_Constraint::ENTITY_A());
-        FeaturePtr aObj = ModelAPI_Feature::feature(aObjRef->object());
+        FeaturePtr aObj;
+        if (aObjRef)
+          aObj = ModelAPI_Feature::feature(aObjRef->object());
         bool aContains = false;
-        if (containsPoint(aObj, aPnt2d, thePos)) {
+        if (aObj && containsPoint(aObj, aPnt2d, thePos)) {
           aContains = true;
         } else {
           aObjRef = aData->refattr(SketchPlugin_Constraint::ENTITY_B());
-          aObj = ModelAPI_Feature::feature(aObjRef->object());
-          if (containsPoint(aObj, aPnt2d, thePos)) {
+          if (aObjRef)
+            aObj = ModelAPI_Feature::feature(aObjRef->object());
+          if (aObj && containsPoint(aObj, aPnt2d, thePos)) {
             aContains = true;
           }
         }