fixed bugs
diff --git a/tasks/main.yml b/tasks/main.yml
index 9b1b5a7..dee2092 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -22,3 +22,4 @@
   loop_control:
     loop_var: result_files
   with_items: '{{ downloads.results }}'
+  when: downloads is defined