diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index 71753a6b3317276d0c936954d346cfb53783b736..86b4b852ebf79de314c5e165c99dfa9c36e11ad1 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -52,7 +52,7 @@ class installer_base {
 	}
 
 	public function update_acme() {
-		$acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh'));
+		$acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null'));
 		$acme = reset($acme);
 		$val = 0;
 
diff --git a/server/lib/classes/letsencrypt.inc.php b/server/lib/classes/letsencrypt.inc.php
index e78ef2636e4aca32451fb53053d1d01edfff9442..72e3fc7e2de8403a861b3549ed1c06502b41c887 100644
--- a/server/lib/classes/letsencrypt.inc.php
+++ b/server/lib/classes/letsencrypt.inc.php
@@ -44,7 +44,7 @@ class letsencrypt {
 	}
 
 	public function get_acme_script() {
-		$acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh'));
+		$acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null'));
 		$acme = reset($acme);
 		if(is_executable($acme)) {
 			return $acme;