diff --git a/tasks/ssl.yml b/tasks/ssl.yml
index 553791f..cb267a2 100644
--- a/tasks/ssl.yml
+++ b/tasks/ssl.yml
@@ -9,7 +9,7 @@
     mode: 0640
     owner: root
     group: root
-  when: zammad_ssl_key is defined or zammad_ssl_key|length > 0
+  when: zammad_ssl_key | default('') | length > 0
 
 - name: SSL | Insert certificate
   ansible.builtin.blockinfile:
@@ -20,7 +20,7 @@
     mode: 0644
     owner: root
     group: root
-  when: zammad_ssl_cert is defined or zammad_ssl_cert|length > 0
+  when: zammad_ssl_cert | default('') | length > 0
 
 - name: SSL | Check if certificate is still valid, ignoring failures
   community.crypto.x509_certificate_info: