Fix crash

src/treestore.c

@@ -734,6 +734,9 @@ tree_store_opendir (char *path)
 			return NULL;
 	}
 
+	if (entry->next == NULL)
+		return NULL;
+	
 	scan = xmalloc (sizeof (tree_scan), "");
 	scan->base = entry;
 	scan->current = entry->next;