From 56f06878e2a9a111f8415ce4ad839b3fe68b85ec Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Wed, 5 Oct 2011 08:10:55 +0200
Subject: [PATCH] Fix crash on parseing invalid GLM syntax

---
 src/math/interaction.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/math/interaction.c b/src/math/interaction.c
index d81eba50..746cc17f 100644
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -60,6 +60,9 @@ interaction_create (const struct variable *v)
 void
 interaction_destroy (struct interaction *i)
 {
+  if (NULL == i)
+    return;
+
   free (i->vars);
   free (i);
 }
-- 
2.30.2