diff --git a/src/mmg3d/tools_3d.c b/src/mmg3d/tools_3d.c
index d535163d3..45e20e2be 100644
--- a/src/mmg3d/tools_3d.c
+++ b/src/mmg3d/tools_3d.c
@@ -595,7 +595,9 @@ inline int MMG5_BezierNom(MMG5_pMesh mesh,MMG5_int ip0,MMG5_int ip1,double s,dou
     /* Coordinates of the new tangent and normal */
     if ( MG_SIN(p0->tag) && MG_SIN(p1->tag) ) {  // function should not be used in that case
         memcpy(to,t0,3*sizeof(double));
-        return 1;
+        /* returning 1 here may create memory error afterward because no (that
+         * is not filled) will be used */
+        return 0;
     }
     else if ( MG_SIN(p0->tag) ) {
         memcpy(n1,&(mesh->xpoint[p1->xp].n1[0]),3*sizeof(double));