diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index 7dcf41c..c2081d7 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -1093,7 +1093,7 @@ ExeSplitCurveAtCorners( int nId, double dTgAngToler, int* pnCount)
   // calcolo i punti di perdita di tangenza
    DBLVECTOR vU ; 
    double dMinCos = cos( dTgAngToler * DEGTORAD) ;
-   for ( int i = 1 ; i < pCompo->GetCurveCount() ; ++ i) {
+   for ( int i = 1 ; bOk && i < pCompo->GetCurveCount() ; ++ i) {
       Point3d ptPrev, ptNext ;
       Vector3d vtPrev, vtNext ;
       if ( pCompo->GetPointTang( i, ICurve::FROM_MINUS, ptPrev, vtPrev)  &&