diff --git a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
index 27b6a5031..0d5f4517c 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
@@ -406,7 +406,7 @@ void CmdSketcherIncreaseDegree::activated(int iMsg)
                                     selection[0].getFeatName(),GeoId);
         }
     }
-    
+
     commitCommand();
 
     ParameterGrp::handle hGrp = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Mod/Sketcher");
diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
index 3542189fc..0e4e889db 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -3619,7 +3619,12 @@ void ViewProviderSketch::draw(bool temp /*=false*/, bool rebuildinformationlayer
                 if(curvaturelist[i] > maxcurv)
                     maxcurv = curvaturelist[i];
 
-                spline->normalAt(paramlist[i],normallist[i]);
+                try {
+                    spline->normalAt(paramlist[i],normallist[i]);
+                }
+                catch(Base::Exception) {
+                    normallist[i] = Base::Vector3d(0,0,0);
+                }
 
                 double temp = ( pointatcurvelist[i] - midp ).Length();