diff --git a/tasks/main.yml b/tasks/main.yml
index 41b4ef5..b778e6f 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -74,6 +74,7 @@
 - name: 'Add cgroups v1 if disabled'
   when:
     - results is defined
+    - results.stdout is defined
     - ' "systemd.unified_cgroup_hierarchy=0" not in results.stdout '
   shell:
     cmd: |
@@ -81,6 +82,7 @@
 - name: 'Reboot to enable cgroups v1'
   when:
     - results is defined
+    - results.stdout is defined
     - ' "systemd.unified_cgroup_hierarchy=0" not in results.stdout '
   reboot:
 - name: 'flush handlers'