From 874f1dec6fda90d351075a302c6356d78347fcb3 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Wed, 16 Oct 2019 14:28:07 +0300
Subject: [PATCH] Issue #3048: Fatal error when create group using filter
 without argument

---
 src/FiltersPlugin/FiltersPlugin_OnPlaneSide.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/FiltersPlugin/FiltersPlugin_OnPlaneSide.cpp b/src/FiltersPlugin/FiltersPlugin_OnPlaneSide.cpp
index 54f8c9391..cfbdff381 100644
--- a/src/FiltersPlugin/FiltersPlugin_OnPlaneSide.cpp
+++ b/src/FiltersPlugin/FiltersPlugin_OnPlaneSide.cpp
@@ -42,8 +42,12 @@ bool FiltersPlugin_OnPlaneSide::isOk(const GeomShapePtr& theShape, const ResultP
   if (!aList.get())
     return false;
   GeomShapePtr aPlanarShape = aList->value();
-  if (!aPlanarShape)
-    aPlanarShape = aList->context()->shape();
+  if (!aPlanarShape) {
+    ResultPtr aContext = aList->context();
+    if (!aContext)
+      return false;
+    aPlanarShape = aContext->shape();
+  }
 
   GeomPlanePtr aPlane = aPlanarShape->face()->getPlane();
   GeomPointPtr aPlaneLoc = aPlane->location();
-- 
2.39.2