diff --git a/src/SMESH/SMESH_MeshEditor.cxx b/src/SMESH/SMESH_MeshEditor.cxx
index d029fe5ca..7466070e4 100644
--- a/src/SMESH/SMESH_MeshEditor.cxx
+++ b/src/SMESH/SMESH_MeshEditor.cxx
@@ -5850,6 +5850,11 @@ SMESH_MeshEditor::ExtrusionSweep (TIDSortedElemSet     theElemSets[2],
           }
           else
           {
+            if ( theParams.ToMakeBoundary() )
+            {
+              GetMeshDS()->Modified();
+              throw SALOME_Exception( SMESH_Comment("Can't extrude node #") << node->GetID() );
+            }
             break; // newNodesItVec will be shorter than nbNodes
           }
         }
diff --git a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
index cb9c2d6bc..2fe9e92bc 100644
--- a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
@@ -1223,8 +1223,8 @@ bool SMESHGUI_ExtrusionDlg::ClickOnApply()
         bool   byAverageNormal   = ByAverageNormalCheck->isChecked();
         int    dim               = (maxSelType == SMESH::FACE) ? 2 : 1;
 
-        groups = meshEditor->ExtrusionByNormal( faces, stepSize, nbSteps, useInputElemsOnly,
-                                                byAverageNormal, makeGroups, dim );
+        groups = meshEditor->ExtrusionByNormal( faces, stepSize, nbSteps, byAverageNormal,
+                                                useInputElemsOnly, makeGroups, dim );
       }
       else
       {
@@ -1261,9 +1261,9 @@ bool SMESHGUI_ExtrusionDlg::ClickOnApply()
       SMESH::Update( actor->getIO(), actor->GetVisibility() );
     if ( makeGroups )
       mySMESHGUI->updateObjBrowser(true); // new groups may appear
-    Init(false);
+
     mySelectionMgr->clearSelected();
-    SelectorWdg->Clear();
+    Init(false);
 
     SMESHGUI::Modified();
   }
@@ -1615,8 +1615,8 @@ void SMESHGUI_ExtrusionDlg::onDisplaySimulation( bool toDisplayPreview )
           bool   byAverageNormal   = ByAverageNormalCheck->isChecked();
           int    dim               = (maxSelType == SMESH::FACE) ? 2 : 1;
 
-          groups = meshEditor->ExtrusionByNormal( faces, stepSize, nbSteps, useInputElemsOnly,
-                                                  byAverageNormal, makeGroups, dim );
+          groups = meshEditor->ExtrusionByNormal( faces, stepSize, nbSteps, byAverageNormal,
+                                                  useInputElemsOnly, makeGroups, dim );
         }
         else
         {
diff --git a/src/SMESH_SWIG/smeshBuilder.py b/src/SMESH_SWIG/smeshBuilder.py
index afa315b9b..df65f685f 100644
--- a/src/SMESH_SWIG/smeshBuilder.py
+++ b/src/SMESH_SWIG/smeshBuilder.py
@@ -5595,6 +5595,8 @@ class Mesh(metaclass = MeshMeta):
         if isinstance( Elements, list ):
             if not Elements:
                 raise RuntimeError("Elements empty!")
+            if isinstance( Elements[0], Mesh ):
+                Elements = [ Elements[0].GetMesh() ]
             if isinstance( Elements[0], int ):
                 Elements = self.GetIDSource( Elements, SMESH.ALL )
                 unRegister.set( Elements )