diff --git a/src/Graphic3d/Graphic3d_Group.cdl b/src/Graphic3d/Graphic3d_Group.cdl
index 5f7f17cb6d..60dbafa968 100755
--- a/src/Graphic3d/Graphic3d_Group.cdl
+++ b/src/Graphic3d/Graphic3d_Group.cdl
@@ -110,10 +110,17 @@
         -- Category: Methods to modify the class definition
         ---------------------------------------------------
     
-        Clear ( me  : mutable )
+        Clear ( me  : mutable;
+                theUpdateStructureMgr : Boolean from Standard = Standard_True )
             is static;
         ---Level: Public
         ---Purpose: Supress all primitives and attributes of <me>.
+        --          To clear group without update in Graphic3d_StructureManager
+        --          pass Standard_False as <theUpdateStructureMgr>. This
+        --          used on context and viewer destruction, when the pointer
+        --          to structure manager in Graphic3d_Structure could be 
+        --          already released (pointers are used here to avoid handle 
+        --          cross-reference);
         ---Category: Methods to modify the class definition
     
         Destroy ( me    : mutable )
diff --git a/src/Graphic3d/Graphic3d_Group_1.cxx b/src/Graphic3d/Graphic3d_Group_1.cxx
index 49110918bb..43a255ea93 100755
--- a/src/Graphic3d/Graphic3d_Group_1.cxx
+++ b/src/Graphic3d/Graphic3d_Group_1.cxx
@@ -27,40 +27,43 @@
 
 //-Methods, in order
 
-void Graphic3d_Group::Clear () {
+void Graphic3d_Group::Clear (Standard_Boolean theUpdateStructureMgr)
+{
+  if (IsDeleted ()) return;
 
-	if (IsDeleted ()) return;
+  MyCGroup.ContextLine.IsSet     = 0,
+  MyCGroup.ContextText.IsSet     = 0,
+  MyCGroup.ContextMarker.IsSet   = 0,
+  MyCGroup.ContextFillArea.IsSet = 0;
 
-	MyCGroup.ContextLine.IsSet	= 0,
-	MyCGroup.ContextText.IsSet	= 0,
-	MyCGroup.ContextMarker.IsSet    = 0,
-	MyCGroup.ContextFillArea.IsSet	= 0;
+  MyCGroup.ContextLine.IsDef     = 0,
+  MyCGroup.ContextText.IsDef     = 0,
+  MyCGroup.ContextMarker.IsDef   = 0,
+  MyCGroup.ContextFillArea.IsDef = 0;
 
-	MyCGroup.ContextLine.IsDef	= 0,
-	MyCGroup.ContextText.IsDef	= 0,
-	MyCGroup.ContextMarker.IsDef    = 0,
-	MyCGroup.ContextFillArea.IsDef	= 0;
+  MyCGroup.PickId.IsDef = 0,
+  MyCGroup.PickId.IsSet = 0,
+  MyCGroup.PickId.Value = 0;
 
-	MyCGroup.PickId.IsDef		= 0,
-	MyCGroup.PickId.IsSet		= 0,
-	MyCGroup.PickId.Value		= 0;
+  MyBounds.XMin	= ShortRealLast (),
+  MyBounds.YMin	= ShortRealLast (),
+  MyBounds.ZMin	= ShortRealLast ();
 
-	MyBounds.XMin	= ShortRealLast (),
-	MyBounds.YMin	= ShortRealLast (),
-	MyBounds.ZMin	= ShortRealLast ();
+  MyBounds.XMax	= ShortRealFirst (),
+  MyBounds.YMax	= ShortRealFirst (),
+  MyBounds.ZMax	= ShortRealFirst ();
 
-	MyBounds.XMax	= ShortRealFirst (),
-	MyBounds.YMax	= ShortRealFirst (),
-	MyBounds.ZMax	= ShortRealFirst ();
+  if (MyContainsFacet) MyStructure->GroupsWithFacet (-1);
+  MyContainsFacet = Standard_False,
+  MyIsEmpty       = Standard_True;
 
-	if (MyContainsFacet) MyStructure->GroupsWithFacet (-1);
-	MyContainsFacet	= Standard_False,
-	MyIsEmpty	= Standard_True;
-
-	MyGraphicDriver->ClearGroup (MyCGroup);
-
-	Update ();
+  MyGraphicDriver->ClearGroup (MyCGroup);
 
+  // clear method could be used on Graphic3d_Structure destruction,
+  // and its structure manager could be already destroyed, in that
+  // case we don't need to update it;
+  if (theUpdateStructureMgr)
+    Update ();
 }
 
 void Graphic3d_Group::Destroy () {
diff --git a/src/Graphic3d/Graphic3d_Structure.cxx b/src/Graphic3d/Graphic3d_Structure.cxx
index 534d547e1b..6d580f1dd0 100755
--- a/src/Graphic3d/Graphic3d_Structure.cxx
+++ b/src/Graphic3d/Graphic3d_Structure.cxx
@@ -261,10 +261,14 @@ void Graphic3d_Structure::Remove () {
 
   Standard_Integer i, Length;
 
-  // clean groups in graphics driver at first
+  // clean groups in graphics driver at first; this is also should be done
+  // to avoid unwanted group cleaning in group's destructor
+  // Pass Standard_False to Clear(..) method to avoid updating in
+  // structure manager, it isn't necessary, besides of it structure manager
+  // could be already destroyed and invalid pointers used in structure;
   Length = MyGroups.Length();
   for (Standard_Integer aGrId = 1; aGrId <= Length; ++aGrId)
-    MyGroups.ChangeValue (aGrId)->Clear();
+    MyGroups.ChangeValue (aGrId)->Clear (Standard_False);
 
   //        Standard_Address APtr = (void *) This ().operator->();
   Standard_Address APtr = (void *) this;