diff --git a/Cassiopee/Converter/Converter/convertStruct2NGon.cpp b/Cassiopee/Converter/Converter/convertStruct2NGon.cpp
index f25f03cbd..d7549ee6a 100644
--- a/Cassiopee/Converter/Converter/convertStruct2NGon.cpp
+++ b/Cassiopee/Converter/Converter/convertStruct2NGon.cpp
@@ -386,10 +386,14 @@ PyObject* K_CONVERTER::convertStruct2NGon(PyObject* self, PyObject* args)
   E_Bool rmOverlappingPts=true; E_Bool rmOrphanPts=false;
   E_Bool rmDuplicatedFaces=true; E_Bool rmDuplicatedElts=false;
   E_Bool rmDegeneratedFaces=true; E_Bool rmDegeneratedElts=false;
-  tpl = K_CONNECT::V_cleanConnectivity(varString, *f2, *cn2, "NGON", tol,
-                                       rmOverlappingPts, rmOrphanPts,
-                                       rmDuplicatedFaces, rmDuplicatedElts,
-                                       rmDegeneratedFaces, rmDegeneratedElts);
-  delete f2; delete cn2;
-  return tpl;
-}
\ No newline at end of file
+  PyObject* tplClean = K_CONNECT::V_cleanConnectivity(
+      varString, *f2, *cn2, "NGON", tol,
+      rmOverlappingPts, rmOrphanPts,
+      rmDuplicatedFaces, rmDuplicatedElts,
+      rmDegeneratedFaces, rmDegeneratedElts
+  );
+  
+  RELEASESHAREDU(tpl, f2, cn2);
+  if (tplClean == NULL) return tpl;
+  else { Py_DECREF(tpl); return tplClean; }
+}
diff --git a/Cassiopee/Converter/Converter/convertUnstruct2NGon.cpp b/Cassiopee/Converter/Converter/convertUnstruct2NGon.cpp
index a398fc160..0e81b6f42 100644
--- a/Cassiopee/Converter/Converter/convertUnstruct2NGon.cpp
+++ b/Cassiopee/Converter/Converter/convertUnstruct2NGon.cpp
@@ -381,10 +381,14 @@ PyObject* K_CONVERTER::convertUnstruct2NGon(PyObject* self, PyObject* args)
   E_Bool rmOverlappingPts=true; E_Bool rmOrphanPts=false;
   E_Bool rmDuplicatedFaces=true; E_Bool rmDuplicatedElts=false;
   E_Bool rmDegeneratedFaces=false; E_Bool rmDegeneratedElts=false;
-  tpl = K_CONNECT::V_cleanConnectivity(varString, *f2, *cn2, "NGON", tol,
-                                       rmOverlappingPts, rmOrphanPts,
-                                       rmDuplicatedFaces, rmDuplicatedElts,
-                                       rmDegeneratedFaces, rmDegeneratedElts);
-  delete f2; delete cn2;
-  return tpl;  
-}
\ No newline at end of file
+  PyObject* tplClean = K_CONNECT::V_cleanConnectivity(
+      varString, *f2, *cn2, "NGON", tol,
+      rmOverlappingPts, rmOrphanPts,
+      rmDuplicatedFaces, rmDuplicatedElts,
+      rmDegeneratedFaces, rmDegeneratedElts
+  );
+  
+  RELEASESHAREDU(tpl, f2, cn2);
+  if (tplClean == NULL) return tpl;
+  else { Py_DECREF(tpl); return tplClean; }
+}
diff --git a/Cassiopee/Generator/Generator/close.cpp b/Cassiopee/Generator/Generator/close.cpp
index 76febf101..761526726 100644
--- a/Cassiopee/Generator/Generator/close.cpp
+++ b/Cassiopee/Generator/Generator/close.cpp
@@ -57,7 +57,7 @@ PyObject* K_GENERATOR::closeMesh(PyObject* self, PyObject* args)
   E_Int posz = K_ARRAY::isCoordinateZPresent(varString);
   if (posx == -1 || posy == -1 || posz == -1)
   {
-    delete f;
+    RELEASESHAREDB(res, array, f, cn);
     PyErr_SetString(PyExc_TypeError,
                     "close: can't find coordinates in array.");
     return NULL;
@@ -68,14 +68,14 @@ PyObject* K_GENERATOR::closeMesh(PyObject* self, PyObject* args)
   {
     closeStructuredMesh(f->begin(posx), f->begin(posy), f->begin(posz), im, jm, km, eps);
     PyObject* tpl = K_ARRAY::buildArray3(*f, varString, im, jm, km); 
-    delete f;
+    RELEASESHAREDS(array, f);
     return tpl;
   }
   else if (res == 2)
   { 
     if (strchr(eltType, '*') != NULL)
     {
-      delete f; delete cn;
+      RELEASESHAREDU(array, f, cn);
       PyErr_SetString(PyExc_TypeError,
                       "close: array must be defined at vertices.");
       return NULL;
@@ -85,10 +85,10 @@ PyObject* K_GENERATOR::closeMesh(PyObject* self, PyObject* args)
         varString, *f, *cn, eltType, eps,
         rmOverlappingPts, rmOrphanPts, rmDuplicatedFaces, rmDuplicatedElts,
         rmDegeneratedFaces, rmDegeneratedElts);
-    if (tpl == NULL) tpl = K_ARRAY::buildArray3(*f, varString, *cn, eltType); // tpl = array;
 
-    delete f; delete cn;
-    return tpl;
+    RELEASESHAREDU(array, f, cn);
+    if (tpl == NULL) return array;
+    else return tpl;
   }
   else
   {
diff --git a/Cassiopee/Post/Post/selectExteriorFaces.cpp b/Cassiopee/Post/Post/selectExteriorFaces.cpp
index abb18fbad..4a1c91f39 100644
--- a/Cassiopee/Post/Post/selectExteriorFaces.cpp
+++ b/Cassiopee/Post/Post/selectExteriorFaces.cpp
@@ -837,9 +837,9 @@ PyObject* K_POST::selectExteriorFacesNGon3D(char* varString, FldArrayF& f,
   {
     e1 = cFE1[i]; // element voisin 1
     e2 = cFE2[i]; // element voisin 2
-    E_Int* face = cn.getFace(i, nbnodes, ngon, indPG);
     if ((e1 == 0 && e2 != 0) || (e2 == 0 && e1 != 0))
     {
+      E_Int* face = cn.getFace(i, nbnodes, ngon, indPG);
       sizeEF2 += nbnodes+shift; nfacesExt++;
       exteriorFaces.push_back(i+1);