X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmath%2Fcategoricals.c;h=239a3a833c6dbb61dd235b7fdaf37a340c78a057;hb=372c46a3648de939ec3224cc94ad944aa39623ae;hp=2a0d4f85ba9e000fb1e4ac36e5d37684f4d2a389;hpb=c427bfc34eb7db7e0b489091430fe1cb373b2261;p=pspp

diff --git a/src/math/categoricals.c b/src/math/categoricals.c
index 2a0d4f85ba..239a3a833c 100644
--- a/src/math/categoricals.c
+++ b/src/math/categoricals.c
@@ -358,7 +358,12 @@ categoricals_update (struct categoricals *cat, const struct ccase *c)
 {
   int i;
   struct variable_node *vn = NULL;
-  const double weight = cat->wv ? case_data (c, cat->wv)->f : 1.0;
+  double weight;
+
+  if (NULL == cat)
+    return;
+
+  weight = cat->wv ? case_data (c, cat->wv)->f : 1.0;
 
   assert (NULL == cat->reverse_variable_map_short);
   assert (NULL == cat->reverse_variable_map_long);
@@ -453,6 +458,9 @@ categoricals_n_total (const struct categoricals *cat)
 size_t
 categoricals_df_total (const struct categoricals *cat)
 {
+  if (NULL == cat)
+    return 0;
+
   return cat->df_sum;
 }
 
@@ -479,6 +487,10 @@ categoricals_done (const struct categoricals *cat_)
   int i;
   int idx_short = 0;
   int idx_long = 0;
+
+  if (NULL == cat)
+    return;
+
   cat->df_sum = 0;
   cat->n_cats_total = 0;