fix null reference

FreeCAD · Jun 29, 2020 · 2035e0c · 2035e0c
1 parent 2c56e3c
commit 2035e0c
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/Mod/Path/Gui/ViewProviderPath.cpp b/src/Mod/Path/Gui/ViewProviderPath.cpp
@@ -120,10 +120,10 @@ class PathSelectionObserver: public Gui::SelectionObserver {
             mat *= linkMat;
             mat.inverse();
             Base::Vector3d pt = mat*Base::Vector3d(msg.x,msg.y,msg.z);
-            const SbVec3f &ptTo = *vp->pcLineCoords->point.getValues(vp->pt0Index);
+            auto ptTo = vp->pcLineCoords->point.getValues(vp->pt0Index);
             SbVec3f ptFrom(pt.x,pt.y,pt.z);
-            if(ptFrom != ptTo) {
-                vp->pcArrowTransform->pointAt(ptFrom,ptTo);
+            if(ptTo && ptFrom != *ptTo) {
+                vp->pcArrowTransform->pointAt(ptFrom,*ptTo);
                 setArrow(vp->pcArrowSwitch);
                 return;
             }