diff --git a/code/ddns-lambda.py b/code/ddns-lambda.py
index 8e7827c..8599fbb 100755
--- a/code/ddns-lambda.py
+++ b/code/ddns-lambda.py
@@ -709,7 +709,10 @@ def lambda_handler(
             f"4.3 instance: {instance_id}, CNAME no valid hostname or zone found, skipping CNAME")
         cf_hostname = None
         cf_zonename = None
-    cf_fqdn = create_fqdn(cf_hostname, cf_zonename)
+    if cf_hostname and cf_zonename:
+        cf_fqdn = create_fqdn(cf_hostname, cf_zonename)
+    else:
+        cf_fqdn = ''
 
 # note this will not continue and set a cname
 
diff --git a/code/ddns-lambda.zip b/code/ddns-lambda.zip
index 099955a..e61149b 100644
Binary files a/code/ddns-lambda.zip and b/code/ddns-lambda.zip differ