diff --git a/files/acme-auth-loopia.py b/files/acme-auth-loopia.py
index 50a8957..21509bf 100755
--- a/files/acme-auth-loopia.py
+++ b/files/acme-auth-loopia.py
@@ -71,14 +71,18 @@ def main():
 
     parts=[]
     while domain:
-        res = client.getSubdomains(user, pwd, domain)
-        if 'UNKNOWN_ERROR' not in res:
+        try:
+            res = client.getSubdomains(user, pwd, domain)
+        except xmlrpc.client.Fault as err:
+            if err.faultCode != 404:
+                raise err
+        else:
             break
         part, domain = domain.split('.', maxsplit=1)
         parts.append(part)
         subdomain = '_acme-challenge.{}'.format('.'.join(parts))
 
-    if 'UNKNOWN_ERROR' in res:
+    if not res:
         print("Failed to find domain in loopiadns")
         return 1
 
diff --git a/files/acme-cleanup-loopia.py b/files/acme-cleanup-loopia.py
index 3836987..2549f82 100755
--- a/files/acme-cleanup-loopia.py
+++ b/files/acme-cleanup-loopia.py
@@ -58,14 +58,18 @@ def main():
 
     parts=[]
     while domain:
-        res = client.getSubdomains(user, pwd, domain)
-        if 'UNKNOWN_ERROR' not in res:
+        try:
+            res = client.getSubdomains(user, pwd, domain)
+        except xmlrpc.client.Fault as err:
+            if err.faultCode != 404:
+                raise err
+        else:
             break
         part, domain = domain.split('.', maxsplit=1)
         parts.append(part)
         subdomain = '_acme-challenge.{}'.format('.'.join(parts))
 
-    if 'UNKNOWN_ERROR' in res:
+    if not res:
         print("Failed to find domain in loopiadns")
         return 1