diff --git a/defaults/main.yml b/defaults/main.yml
index e2b0e47..712f7ea 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -36,7 +36,7 @@ ldaptoolbox_openldap_slapd_cli_cmd: /usr/local/openldap/sbin/slapd-cli
 ################################################################################
 
 # Options
-olcAttributeOptions:
+ldaptoolbox_openldap_olcAttributeOptions:
   - lang-
 
 # Suffix
diff --git a/tasks/ldaptoolbox-certificates.yml b/tasks/ldaptoolbox-certificates.yml
index 6ab5039..88bde05 100644
--- a/tasks/ldaptoolbox-certificates.yml
+++ b/tasks/ldaptoolbox-certificates.yml
@@ -3,7 +3,7 @@
     path: "{{ ldaptoolbox_openldap_olcTLSCACertificateFile | dirname }}"
     state: directory
     mode: '0755'
-  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile )
+  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile is defined ) and ( ldaptoolbox_openldap_olcTLSCACertificateFile )
 
 - name: Deploy TLS CA certificate
   ansible.builtin.copy:
@@ -12,7 +12,7 @@
     owner: root
     group: ldap
     mode: 0644
-  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile )
+  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile is defined ) and ( ldaptoolbox_openldap_olcTLSCACertificateFile )
 
 - name: Deploy TLS certificate
   ansible.builtin.copy:
@@ -21,7 +21,7 @@
     owner: root
     group: ldap
     mode: 0644
-  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile )
+  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile is defined ) and ( ldaptoolbox_openldap_olcTLSCACertificateFile )
 
 - name: Deploy TLS key file
   ansible.builtin.copy:
@@ -31,7 +31,7 @@
     group: ldap
     mode: 0640
   no_log: true
-  when: ( ldaptoolbox_openldap_olcTLSCertificateKeyFile )
+  when: ( ldaptoolbox_openldap_olcTLSCertificateKeyFile is defined ) and ( ldaptoolbox_openldap_olcTLSCertificateKeyFile )
 
 - name: Deploy Diffie-Hellman param
   ansible.builtin.copy:
@@ -41,14 +41,14 @@
     group: ldap
     mode: 0640
   no_log: true
-  when: ( ldaptoolbox_openldap_olcTLSDHParamFile )
+  when: ( ldaptoolbox_openldap_olcTLSDHParamFile is defined ) and ( ldaptoolbox_openldap_olcTLSDHParamFile )
 
 - name: allow ldap to read TLS certificates
   ansible.builtin.user:
     name: "{{ ldaptoolbox_openldap_configuration_owner }}"
     groups: "{{ ldaptoolbox_openldap_sslgroup }}"
     state: present
-  when: ( ldaptoolbox_openldap_olcTLSCertificateFile )
+  when: ( ldaptoolbox_openldap_olcTLSCertificateFile is defined ) and ( ldaptoolbox_openldap_olcTLSCertificateFile )
 
 - name: Adapt ldap.conf file with CA certificate
   ansible.builtin.blockinfile:
@@ -58,4 +58,4 @@
     block: |
       TLS_CACERT {{ ldaptoolbox_openldap_olcTLSCACertificateFile }}
       TLS_REQCERT demand
-  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile )
+  when: ( ldaptoolbox_openldap_olcTLSCACertificateFile is defined ) and ( ldaptoolbox_openldap_olcTLSCACertificateFile )