diff --git a/lib/ansible/modules/cloud/univention/udm_dns_record.py b/lib/ansible/modules/cloud/univention/udm_dns_record.py
index 1955db5d980..a39c9cccb67 100644
--- a/lib/ansible/modules/cloud/univention/udm_dns_record.py
+++ b/lib/ansible/modules/cloud/univention/udm_dns_record.py
@@ -123,6 +123,7 @@ def main():
     data = module.params['data']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=dNSZone)(zoneName={0})(relativeDomainName={1}))'.format(zone, name),
diff --git a/lib/ansible/modules/cloud/univention/udm_dns_zone.py b/lib/ansible/modules/cloud/univention/udm_dns_zone.py
index 261e67149ae..cadb6dd87a9 100644
--- a/lib/ansible/modules/cloud/univention/udm_dns_zone.py
+++ b/lib/ansible/modules/cloud/univention/udm_dns_zone.py
@@ -170,6 +170,7 @@ def main():
     mx = module.params['mx']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=dNSZone)(zoneName={0}))'.format(zone),
diff --git a/lib/ansible/modules/cloud/univention/udm_group.py b/lib/ansible/modules/cloud/univention/udm_group.py
index f5a63915cd8..ff00a98a6db 100644
--- a/lib/ansible/modules/cloud/univention/udm_group.py
+++ b/lib/ansible/modules/cloud/univention/udm_group.py
@@ -112,6 +112,7 @@ def main():
     subpath = module.params['subpath']
     state = module.params['state']
     changed = False
+    diff = None
 
     groups = list(ldap_search(
         '(&(objectClass=posixGroup)(cn={0}))'.format(name),
diff --git a/lib/ansible/modules/cloud/univention/udm_share.py b/lib/ansible/modules/cloud/univention/udm_share.py
index 133bd400be4..35aa1e29dbd 100644
--- a/lib/ansible/modules/cloud/univention/udm_share.py
+++ b/lib/ansible/modules/cloud/univention/udm_share.py
@@ -477,6 +477,7 @@ def main():
     name = module.params['name']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=univentionShare)(cn={0}))'.format(name),
diff --git a/lib/ansible/modules/cloud/univention/udm_user.py b/lib/ansible/modules/cloud/univention/udm_user.py
index 9c456844ece..cda8d788885 100644
--- a/lib/ansible/modules/cloud/univention/udm_user.py
+++ b/lib/ansible/modules/cloud/univention/udm_user.py
@@ -413,6 +413,7 @@ def main():
     subpath = module.params['subpath']
     state = module.params['state']
     changed = False
+    diff = None
 
     users = list(ldap_search(
         '(&(objectClass=posixAccount)(uid={0}))'.format(username),