diff --git a/SurfFlatRegionOffset.cpp b/SurfFlatRegionOffset.cpp
index cda1912..4d549a3 100644
--- a/SurfFlatRegionOffset.cpp
+++ b/SurfFlatRegionOffset.cpp
@@ -209,7 +209,7 @@ SurfFlatRegion::Offset( double dDist, int nType)
 
   // se offset nullo, non devo fare alcunchè
    if ( abs( dDist) < 10 * EPS_SMALL)
-      return this->Clone() ;
+      return true ;
   
   // calcolo la superficie di offset
    PtrOwner<SurfFlatRegion> pSfr( CreateOffsetSurf( dDist, nType)) ;