diff --git a/roles/kubernetes/master/tasks/kubeadm-setup.yml b/roles/kubernetes/master/tasks/kubeadm-setup.yml
index bf72821fe6c33145a7c8de13eb56622a0be06a6e..19f9183382041b8e4c3678805f2da4a7f05b5170 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"