Index: abstract.c
===================================================================
--- abstract.c	(revision 10095)
+++ abstract.c	(revision 10096)
@@ -102,7 +102,7 @@
 	htsp_init(&abs->nets, strhash, strkeyeq);
 	htsp_init(&abs->comps, strhash, strkeyeq);
 	htip_init(&abs->aid2obj, longhash, longkeyeq);
-	abs->hroot = csch_hlevel_new(NULL);
+	abs->hroot = csch_hlevel_new(NULL, NULL);
 	abs->next_aid = 1;
 }