diff --git a/roles/ariane/tasks/zfs.yml b/roles/ariane/tasks/zfs.yml
index f648f29..3ff9900 100644
--- a/roles/ariane/tasks/zfs.yml
+++ b/roles/ariane/tasks/zfs.yml
@@ -16,9 +16,6 @@
   register: snapshot_cron
   changed_when: False
 
-- name: ddd
-  debug: var=snapshot_cron.stdout_lines
-
 - name: zfs - zfs-auto-snapshot prefix
   lineinfile:
     dest: "{{ item }}"
@@ -26,6 +23,7 @@
     line: \1 --prefix= //
     backrefs: yes
   with_items: "{{ snapshot_cron.stdout_lines }}"
+  when: snapshot_cron.stdout_lines is defined
 
 - name: zfs - load module
   modprobe: name=zfs