From adcd46da55303428ba26ee1846ad12b577c8bc8b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=BCtter?= <sebastian.huetter@ovgu.de>
Date: Wed, 6 Mar 2019 12:59:37 +0100
Subject: [PATCH] require an atom map for dynamical_matrix

---
 src/USER-PHONON/dynamical_matrix.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/USER-PHONON/dynamical_matrix.cpp b/src/USER-PHONON/dynamical_matrix.cpp
index 372f4e4e31..c12bf6873e 100644
--- a/src/USER-PHONON/dynamical_matrix.cpp
+++ b/src/USER-PHONON/dynamical_matrix.cpp
@@ -138,6 +138,9 @@ void DynamicalMatrix::command(int narg, char **arg)
     else if (style == ESKM) options(narg-3,&arg[3]); //COME BACK
     else if (comm->me == 0 && screen) fprintf(screen,"Illegal Dynamical Matrix command\n");
 
+    if (atom->map_style == 0)
+      error->all(FLERR,"Dynamical_matrix command requires an atom map, see atom_modify");
+
     // move atoms by 3-vector or specified variable(s)
 
     if (style == REGULAR) {