Ooops. Check if area-id format is valid.
diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 7a5c49a..2b2c000 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -1702,6 +1702,8 @@
   struct in_addr area_id;
   int format;
 
+  VTY_GET_OSPF_AREA_ID (area_id, format, argv[0]);
+
   area = ospf_area_get (ospf, area_id, format);
   ospf_area_export_list_set (ospf, area, argv[1]);
 
@@ -1723,6 +1725,8 @@
   struct in_addr area_id;
   int format;
 
+  VTY_GET_OSPF_AREA_ID (area_id, format, argv[0]);
+
   area = ospf_area_lookup_by_area_id (ospf, area_id);
   if (area == NULL)
     return CMD_SUCCESS;
@@ -1747,6 +1751,8 @@
   struct in_addr area_id;
   int format;
 
+  VTY_GET_OSPF_AREA_ID (area_id, format, argv[0]);
+
   area = ospf_area_get (ospf, area_id, format);
   ospf_area_import_list_set (ospf, area, argv[1]);
 
@@ -1768,6 +1774,8 @@
   struct in_addr area_id;
   int format;
 
+  VTY_GET_OSPF_AREA_ID (area_id, format, argv[0]);
+
   area = ospf_area_lookup_by_area_id (ospf, area_id);
   if (area == NULL)
     return CMD_SUCCESS;