diff --git a/tasks/main.yml b/tasks/main.yml
index b771ee4..a394037 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,18 +1,23 @@
 ---
+# Due to inverse logic behaviour when searching for an item in an undefined list.
+- set_fact:
+    borgbackup_servers_group: "{{ groups.borgbackup_servers | default([]) }} "
+    borgbackup_management_group: "{{ groups.borgbackup_management | default([]) }}"
+
 - include_tasks: install.yml
   when: >
     borgbackup_required == True or
-    inventory_hostname in groups.borgbackup_servers
+    inventory_hostname in borgbackup_servers_group
 
 - include_tasks: borg-server.yml
-  when: inventory_hostname in groups.borgbackup_servers
+  when: inventory_hostname in borgbackup_servers_group
 
 - include_tasks: borg-client.yml
   when: >
     borgbackup_required == True and
-    inventory_hostname not in groups.borgbackup_servers
+    inventory_hostname not in borgbackup_servers_group
 
 - include_tasks: management.yml
   when: >
-    inventory_hostname in groups.borgbackup_management and
-    inventory_hostname not in groups.borgbackup_servers
+    inventory_hostname in borgbackup_management_group and
+    inventory_hostname not in borgbackup_servers_group