diff --git a/create_inventory_lxc.yml b/create_inventory_lxc.yml
index 2fc17d0..13d0990 100644
--- a/create_inventory_lxc.yml
+++ b/create_inventory_lxc.yml
@@ -76,6 +76,13 @@
       when: inventory_hostname in groups.lxc_hosts
 
 
+    - name: Sanity checks
+      assert:
+        that:
+          - ssh_keys is defined
+          - ssh_keys is iterable
+
+
     - name: Check for no-validate parameter in download template
       shell: "/usr/share/lxc/templates/lxc-download --help | grep no-validate || true"
       changed_when: false