From c37e13b76d595e7d6eee07eff61d6230cd1fa97d Mon Sep 17 00:00:00 2001
From: Keith Sloan <keith@sloan-home.co.uk>
Date: Thu, 11 May 2017 14:41:27 +0100
Subject: [PATCH] Fix for linear_extrude request of null object i.e. null text

---
 src/Mod/OpenSCAD/importCSG.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/OpenSCAD/importCSG.py b/src/Mod/OpenSCAD/importCSG.py
index 06cb4d82c4..3cd6120a4f 100644
--- a/src/Mod/OpenSCAD/importCSG.py
+++ b/src/Mod/OpenSCAD/importCSG.py
@@ -653,6 +653,10 @@ def p_linear_extrude_with_twist(p):
         t = float(p[3]['twist'])
     else:
         t = 0
+    # Test if null object like from null text
+    if (len(p[6]) == 0) :
+        p[0] = []
+        return
     if (len(p[6]) > 1) :
         obj = fuse(p[6],"Linear Extrude Union")
     else :