diff --git a/lib/Froxlor/Cron/Http/Apache.php b/lib/Froxlor/Cron/Http/Apache.php
index 921faf3d..6bc3e4b9 100644
--- a/lib/Froxlor/Cron/Http/Apache.php
+++ b/lib/Froxlor/Cron/Http/Apache.php
@@ -413,7 +413,7 @@ class Apache extends HttpConfigBase
 						$this->virtualhosts_data[$vhosts_filename] .= $this->processSpecialConfigTemplate($row_ipsandports['ssl_specialsettings'], $domain, $row_ipsandports['ip'], $row_ipsandports['port'], $row_ipsandports['ssl'] == '1') . "\n";
 					}
 
-					if ($row_ipsandports['ssl_cert_file'] == '') {
+					if ($row_ipsandports['ssl_cert_file'] == '' || ! file_exists($row_ipsandports['ssl_cert_file'])) {
 						$row_ipsandports['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 						if (! file_exists($row_ipsandports['ssl_cert_file'])) {
 							// explicitly disable ssl for this vhost
@@ -950,7 +950,7 @@ class Apache extends HttpConfigBase
 		}
 
 		if ($ssl_vhost === true && $domain['ssl'] == '1' && Settings::Get('system.use_ssl') == '1') {
-			if ($domain['ssl_cert_file'] == '') {
+			if ($domain['ssl_cert_file'] == '' || ! file_exists($domain['ssl_cert_file'])) {
 				$domain['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 				if (! file_exists($domain['ssl_cert_file'])) {
 					// explicitly disable ssl for this vhost
diff --git a/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php b/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
index 3e7338e3..b476f755 100644
--- a/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
+++ b/lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php
@@ -502,7 +502,7 @@ class AcmeSh extends \Froxlor\Cron\FroxlorCron
 
 		if (is_dir($certificate_folder) && file_exists($ssl_file) && is_readable($ssl_file)) {
 			$cert_data = openssl_x509_parse(file_get_contents($ssl_file));
-			if ($cert_data['validTo_time_t'] > strtotime($cert_date)) {
+			if ($cert_data && $cert_data['validTo_time_t'] > strtotime($cert_date)) {
 				return true;
 			}
 		}
diff --git a/lib/Froxlor/Cron/Http/Lighttpd.php b/lib/Froxlor/Cron/Http/Lighttpd.php
index 513efb95..5698ee0c 100644
--- a/lib/Froxlor/Cron/Http/Lighttpd.php
+++ b/lib/Froxlor/Cron/Http/Lighttpd.php
@@ -188,7 +188,7 @@ class Lighttpd extends HttpConfigBase
 					$this->lighttpd_data[$vhost_filename] .= $this->processSpecialConfigTemplate($row_ipsandports['ssl_specialsettings'], $domain, $row_ipsandports['ip'], $row_ipsandports['port'], $row_ipsandports['ssl'] == '1') . "\n";
 				}
 
-				if ($row_ipsandports['ssl_cert_file'] == '') {
+				if ($row_ipsandports['ssl_cert_file'] == '' || ! file_exists($row_ipsandports['ssl_cert_file'])) {
 					$row_ipsandports['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 					if (! file_exists($row_ipsandports['ssl_cert_file'])) {
 						// explicitly disable ssl for this vhost
@@ -555,7 +555,7 @@ class Lighttpd extends HttpConfigBase
 		$ssl_settings = '';
 
 		if ($ssl_vhost === true && $domain['ssl'] == '1' && (int) Settings::Get('system.use_ssl') == 1) {
-			if ($domain['ssl_cert_file'] == '') {
+			if ($domain['ssl_cert_file'] == '' || ! file_exists($domain['ssl_cert_file'])) {
 				$domain['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 				if (! file_exists($domain['ssl_cert_file'])) {
 					// explicitly disable ssl for this vhost
diff --git a/lib/Froxlor/Cron/Http/Nginx.php b/lib/Froxlor/Cron/Http/Nginx.php
index b2358dd1..4325bb15 100644
--- a/lib/Froxlor/Cron/Http/Nginx.php
+++ b/lib/Froxlor/Cron/Http/Nginx.php
@@ -155,7 +155,7 @@ class Nginx extends HttpConfigBase
 				// we know whether it's an ssl vhost or not
 				$ssl_vhost = false;
 				if ($row_ipsandports['ssl'] == '1') {
-					if ($row_ipsandports['ssl_cert_file'] == '') {
+					if ($row_ipsandports['ssl_cert_file'] == '' || ! file_exists($row_ipsandports['ssl_cert_file'])) {
 						$row_ipsandports['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 						if (! file_exists($row_ipsandports['ssl_cert_file'])) {
 							// explicitly disable ssl for this vhost
@@ -659,7 +659,7 @@ class Nginx extends HttpConfigBase
 	{
 		$sslsettings = '';
 
-		if ($domain_or_ip['ssl_cert_file'] == '') {
+		if ($domain_or_ip['ssl_cert_file'] == '' || ! file_exists($domain_or_ip['ssl_cert_file'])) {
 			$domain_or_ip['ssl_cert_file'] = Settings::Get('system.ssl_cert_file');
 			if (! file_exists($domain_or_ip['ssl_cert_file'])) {
 				// explicitly disable ssl for this vhost