diff --git a/ospfd/ospf_dump.c b/ospfd/ospf_dump.c
index fe75a96..ccee1d6 100644
--- a/ospfd/ospf_dump.c
+++ b/ospfd/ospf_dump.c
@@ -325,12 +325,14 @@
 void
 ospf_lsa_header_dump (struct lsa_header *lsah)
 {
+  char *lsah_type = LOOKUP (ospf_lsa_type_msg, lsah->type);
+  
   zlog_info ("  LSA Header");
   zlog_info ("    LS age %d", ntohs (lsah->ls_age));
   zlog_info ("    Options %d (%s)", lsah->options,
 	     ospf_options_dump (lsah->options));
   zlog_info ("    LS type %d (%s)", lsah->type,
-	     LOOKUP (ospf_lsa_type_msg, lsah->type));
+             (lsah->type ? lsah->type : "unknown type"));
   zlog_info ("    Link State ID %s", inet_ntoa (lsah->id));
   zlog_info ("    Advertising Router %s", inet_ntoa (lsah->adv_router));
   zlog_info ("    LS sequence number 0x%lx", (u_long)ntohl (lsah->ls_seqnum));