diff --git a/roles/kubernetes/master/tasks/kubeadm-setup.yml b/roles/kubernetes/master/tasks/kubeadm-setup.yml
index bf72821fe..19f918338 100644
--- a/roles/kubernetes/master/tasks/kubeadm-setup.yml
+++ b/roles/kubernetes/master/tasks/kubeadm-setup.yml
@@ -55,7 +55,7 @@
 
 - name: kubeadm | aggregate all SANs
   set_fact:
-    apiserver_sans: "{{ (sans_base + groups['kube-master'] + sans_lb + sans_lb_ip + sans_supp + sans_access_ip + sans_ip + sans_address + sans_override) | unique }}"
+    apiserver_sans: "{{ (sans_base + groups['kube-master'] + sans_lb + sans_lb_ip + sans_supp + sans_access_ip + sans_ip + sans_address + sans_override) | select('defined') |unique }}"
   vars:
     sans_base:
       - "kubernetes"