diff --git a/EGkGeoObjSave.h b/EGkGeoObjSave.h
index a046f10..101cd33 100644
--- a/EGkGeoObjSave.h
+++ b/EGkGeoObjSave.h
@@ -113,7 +113,7 @@ SaveGeoObj( std::vector<std::vector<IGeoObj*>> vvpGObj, std::vector<Color> vCol,
       nLayId = pGeomDB->AddGroup( GDB_ID_NULL, nPartId, Frame3d()) ;
       pGeomDB->SetMaterial( nLayId, vCol[i]) ;
 
-      for ( int j = 0 ; j < int( vvpGObj.size()) ; ++ j) {
+      for ( int j = 0 ; j < int( vvpGObj[i].size()) ; ++ j ) {
         // inserisco gli oggetti corrispondenti
          int nId = pGeomDB->AddGeoObj( GDB_ID_NULL, nLayId, vvpGObj[i][j]) ;
          vIds.push_back( nId) ;