diff --git a/ospf6d/ospf6_spf.c b/ospf6d/ospf6_spf.c
index e78f7f6..a4a5b72 100644
--- a/ospf6d/ospf6_spf.c
+++ b/ospf6d/ospf6_spf.c
@@ -391,10 +391,6 @@
   caddr_t lsdesc;
   struct ospf6_lsa *lsa;
 
-  /* initialize */
-  candidate_list = pqueue_create ();
-  candidate_list->cmp = ospf6_vertex_cmp;
-
   ospf6_spf_table_finish (result_table);
 
   /* Install the calculating router itself as the root of the SPF tree */
@@ -403,6 +399,11 @@
                            router_id, oa->lsdb);
   if (lsa == NULL)
     return;
+
+  /* initialize */
+  candidate_list = pqueue_create ();
+  candidate_list->cmp = ospf6_vertex_cmp;
+
   root = ospf6_vertex_create (lsa);
   root->area = oa;
   root->cost = 0;