diff --git a/smmapdfw/libsmmapdfw/dns.c b/smmapdfw/libsmmapdfw/dns.c
index fa99620..71d5f48 100644
--- a/smmapdfw/libsmmapdfw/dns.c
+++ b/smmapdfw/libsmmapdfw/dns.c
@@ -243,7 +243,7 @@ a_rdata_t** get_a_rrs(char *domain) {
   cname_rdata_t **cname_rdata;
 
   rdata = (rdata_t**) get_rrs(domain, T_A);
-  if (NULL == *rdata)
+  if ((NULL == rdata) || (NULL == *rdata))
     return NULL;
 
   if ((*rdata)->type == T_CNAME) {