From ed240535f265958c1898ed32e20829ae0170e993 Mon Sep 17 00:00:00 2001
From: Yorik van Havre <yorik@uncreated.net>
Date: Thu, 22 Feb 2018 15:27:16 -0300
Subject: [PATCH] Draft: Small bugfix in dimensions

---
 src/Mod/Draft/Draft.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Draft/Draft.py b/src/Mod/Draft/Draft.py
index 09f0a5417b..5e5d289359 100644
--- a/src/Mod/Draft/Draft.py
+++ b/src/Mod/Draft/Draft.py
@@ -4046,7 +4046,9 @@ class _ViewProviderDimension(_ViewProviderDraft):
                         proj = None
                     else:
                         base = Part.LineSegment(self.p2,self.p3).toShape()
-                        proj = DraftGeomUtils.findDistance(self.p1,base).negative()
+                        proj = DraftGeomUtils.findDistance(self.p1,base)
+                        if proj:
+                            proj = proj.negative()
             if not base:
                 if DraftVecUtils.equals(self.p1,self.p4):
                     base = None