diff --git a/validate-my-dns.py b/validate-my-dns.py
old mode 100644
new mode 100755
index f021b59..de5bbc9
--- a/validate-my-dns.py
+++ b/validate-my-dns.py
@@ -178,6 +178,10 @@ def get_domain_by_mntner(mntner):
 def get_dnskey(domain_name, nserver):
     """query dns server for DNSKEY"""
     global errors
+    if nserver == None:
+        print("WARN: nserver specified was 'None'")
+        errors += 1
+        return False
     try:
         request = dns.message.make_query(
             domain_name, dns.rdatatype.DNSKEY, want_dnssec=False)
@@ -433,7 +437,7 @@ def main(mntner):
                         f"INFO: correct ds-rdata specified and matching DNSKEY returned by {ip} for {domain_name}")
                 else:
                     print(
-                        f"ERROR: invalid ds-rdata specified and matching DNSKEY returned by {ip} for {domain_name}")
+                        f"ERROR: invalid ds-rdata specified or non-matching DNSKEY returned by {ip} for {domain_name}")
                     errors += 1
             # break