X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmath%2Finteraction.c;h=706092476ec2b3bb8f3f391de37338ffe2ccdbed;hb=970789e054086189cb8d83b8c80f6c10318bbeef;hp=4e4134f0ffcceb0b1ac79b5a8e0b583a3924be41;hpb=759c65a59048de2b9d2ab35cf817fcce52d236f3;p=pspp-builds.git

diff --git a/src/math/interaction.c b/src/math/interaction.c
index 4e4134f0..70609247 100644
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2011 Free Software Foundation, Inc.
+   Copyright (C) 2011, 2012 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -163,6 +163,8 @@ void
 interaction_to_string (const struct interaction *iact, struct string *str)
 {
   int v = 0;
+  if ( iact->n_vars == 0)
+    return;
   ds_put_cstr (str, var_to_string (iact->vars[v]));
   for (v = 1; v < iact->n_vars; ++v)
     {