From 74ef899a75d67716937ffb8afcb04fe62de4c233 Mon Sep 17 00:00:00 2001
From: Eric Trombly <etrombly@yahoo.com>
Date: Fri, 26 Jun 2020 11:27:09 -0500
Subject: [PATCH] check if pcLineCoords is empty

---
 src/Mod/Path/Gui/ViewProviderPath.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/Mod/Path/Gui/ViewProviderPath.cpp b/src/Mod/Path/Gui/ViewProviderPath.cpp
index 3ac3416d64..2a828e8243 100644
--- a/src/Mod/Path/Gui/ViewProviderPath.cpp
+++ b/src/Mod/Path/Gui/ViewProviderPath.cpp
@@ -120,12 +120,14 @@ public:
             mat *= linkMat;
             mat.inverse();
             Base::Vector3d pt = mat*Base::Vector3d(msg.x,msg.y,msg.z);
-            auto ptTo = vp->pcLineCoords->point.getValues(vp->pt0Index);
-            SbVec3f ptFrom(pt.x,pt.y,pt.z);
-            if(ptTo && ptFrom != *ptTo) {
-                vp->pcArrowTransform->pointAt(ptFrom,*ptTo);
-                setArrow(vp->pcArrowSwitch);
-                return;
+            if(vp->pcLineCoords->point.getNum() > 0){
+                auto ptTo = vp->pcLineCoords->point.getValues(vp->pt0Index);
+                SbVec3f ptFrom(pt.x,pt.y,pt.z);
+                if(ptTo && ptFrom != *ptTo) {
+                    vp->pcArrowTransform->pointAt(ptFrom,*ptTo);
+                    setArrow(vp->pcArrowSwitch);
+                    return;
+                }
             }
         }
         setArrow();