diff --git a/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php b/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
index a5cb15b2..cd2f2913 100644
--- a/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
+++ b/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
@@ -278,7 +278,7 @@ class AcmeSh extends \Froxlor\Cron\FroxlorCron
 				$cronlog->logAction(FroxlorLogger::CRON_ACTION, LOG_INFO, "Validating DNS of " . $domain);
 				// ips accordint to NS
 				$domain_ips = PhpHelper::gethostbynamel6($domain);
-				if (count(array_intersect($our_ips, $domain_ips)) <= 0) {
+				if ($domain_ips == false || count(array_intersect($our_ips, $domain_ips)) <= 0) {
 					// no common ips...
 					$cronlog->logAction(FroxlorLogger::CRON_ACTION, LOG_WARNING, "Skipping Let's Encrypt generation for " . $domain . " due to no system known IP address via DNS check");
 					unset($domains[$idx]);