From e5f496698656551b422a4ea1a6d6246fac833d8a Mon Sep 17 00:00:00 2001
From: sjplimp <sjplimp@f3b2605a-c512-4ea7-a41b-209d697bcdaa>
Date: Wed, 11 Sep 2013 00:05:07 +0000
Subject: [PATCH] git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@10760
 f3b2605a-c512-4ea7-a41b-209d697bcdaa

---
 src/fix_property_atom.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/fix_property_atom.cpp b/src/fix_property_atom.cpp
index fa7a51fab0..ee05a91b73 100644
--- a/src/fix_property_atom.cpp
+++ b/src/fix_property_atom.cpp
@@ -159,6 +159,10 @@ void FixPropertyAtom::read_data_section(char *keyword, int n, char *buf)
   int j,m,tagdata;
   char *next;
 
+  if (atom->map_style == 0) 
+    error->all(FLERR,"Fix property/atom cannot read from data file "
+               "unless an atom map is defined");
+
   next = strchr(buf,'\n');
   *next = '\0';
   int nwords = atom->count_words(buf);