diff --git a/Pocketing.cpp b/Pocketing.cpp
index 653a203..0d6caa2 100644
--- a/Pocketing.cpp
+++ b/Pocketing.cpp
@@ -4540,7 +4540,7 @@ Pocketing::ComputeTrapezoidSpiralLeadInLeadOut( ICurveComposite* pCompo, const V
       double dDistMin ;
       Vector3d vtNormMin ;
       if ( CalcDistanceFromRawSurface( m_nPhase, ptP, vtNorm, dDistMin, vtNormMin)) {
-         if ( abs( dDistMin) < abs( dDist)) {
+         if ( abs( dDistMin) < abs( dDist) && abs( dDistMin) > EPS_SMALL) {
             dDistRef = dDistMin ;
             dCorr = dDist / dDistMin ;           
          }