diff --git a/smmapdfw/libsmmapdfw/dns.c b/smmapdfw/libsmmapdfw/dns.c
index ac9639c..fa99620 100644
--- a/smmapdfw/libsmmapdfw/dns.c
+++ b/smmapdfw/libsmmapdfw/dns.c
@@ -243,6 +243,9 @@ a_rdata_t** get_a_rrs(char *domain) {
   cname_rdata_t **cname_rdata;
 
   rdata = (rdata_t**) get_rrs(domain, T_A);
+  if (NULL == *rdata)
+    return NULL;
+
   if ((*rdata)->type == T_CNAME) {
     cname_rdata = (cname_rdata_t**) rdata;
     rdata2 = (rdata_t**) get_a_rrs((*cname_rdata)->cname);