diff --git a/ospf6d/ospf6_lsa.c b/ospf6d/ospf6_lsa.c
index 48f79af..4d3287d 100644
--- a/ospf6d/ospf6_lsa.c
+++ b/ospf6d/ospf6_lsa.c
@@ -97,6 +97,9 @@
   else
     handler = vector_slot (ospf6_lsa_handler_vector, index);
 
+  if (handler == NULL)
+    handler = &unknown_handler;
+
   return handler;
 }