Fix crash in Correlations

diff --git a/src/math/categoricals.c b/src/math/categoricals.c
index f1bd09023758c0777507ca752b7b8462c23d5ea1..d3aa372867249807618885cf697d66984a8233fc 100644 (file)
--- a/src/math/categoricals.c
+++ b/src/math/categoricals.c
@@ -245,6 +245,8 @@ categoricals_destroy (struct categoricals *cat)
 {
   struct variable_node *vn = NULL;
   int i;
+  if (NULL == cat)
+    return;
   for (i = 0; i < cat->n_iap; ++i)
     {
       struct interaction_value *iv = NULL;