diff --git a/sites.py b/sites.py
index e1ad27e..6a1a35e 100644
--- a/sites.py
+++ b/sites.py
@@ -267,10 +267,12 @@ def write_nginx_conf(site):
         for alt in site['alt_domains']:
             if is_icann(alt):
                 icann_domains.append(alt)
-    email = f'admin@{icann_domains[0]}'
-    icann_domains = " -d ".join(icann_domains)
-    icann_domains = f'-d {icann_domains}'
-    os.system(f'certbot --nginx {icann_domains} --non-interactive --agree-tos --email {email} --redirect')
+
+    if len(icann_domains) > 0:
+        email = f'admin@{icann_domains[0]}'
+        icann_domains = " -d ".join(icann_domains)
+        icann_domains = f'-d {icann_domains}'
+        os.system(f'certbot --nginx {icann_domains} --non-interactive --agree-tos --email {email} --redirect')
     return True