diff --git a/functions/classes/class.PDO.php b/functions/classes/class.PDO.php
index aeb940c..1f076a2 100644
--- a/functions/classes/class.PDO.php
+++ b/functions/classes/class.PDO.php
@@ -1042,6 +1042,13 @@ private function set_db_params () {
 				$this->ssl[PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT] = false;
 			}
 
+			$db += [
+				'ssl_key'    => null,
+				'ssl_cert'   => null,
+				'ssl_ca'     => null,
+				'ssl_cipher' => null,
+				'ssl_capath' => null
+			];
 			foreach ($this->pdo_ssl_opts as $key => $pdoopt) {
 				if ($db[$key]) {
 					$this->ssl[$pdoopt] = $db[$key];
diff --git a/functions/classes/class.Scan.php b/functions/classes/class.Scan.php
index e79a1b0..5cfba6d 100644
--- a/functions/classes/class.Scan.php
+++ b/functions/classes/class.Scan.php
@@ -446,6 +446,7 @@ public function ping_address_method_fping_subnet ($subnet_cidr, $return_result =
 	    exec($cmd, $output, $retval);
 
 	    # save result
+	    $out = null;
 	    if(sizeof($output)>0) {
 	    	foreach($output as $line) {
 if (!preg_match('/timed out/', $line)) {
@@ -921,4 +922,4 @@ function fping_subnet ($subnet_cidr, $return = true) {
 	global $Scan;
 	//scan
 	return $Scan->ping_address_method_fping_subnet ($subnet_cidr, $return);
-}
\ No newline at end of file
+}
diff --git a/functions/classes/class.phpipamAgent.php b/functions/classes/class.phpipamAgent.php
index aaf1f8d..8ed95c0 100644
--- a/functions/classes/class.phpipamAgent.php
+++ b/functions/classes/class.phpipamAgent.php
@@ -1025,7 +1025,7 @@ private function mysql_scan_discovered_write_to_db ($subnets) {
 		}
 		// loop
 		foreach($subnets as $s) {
-			if(is_array($s->discovered)) {
+			if (isset($s->discovered) && is_array($s->discovered)) {
 				foreach($s->discovered as $ip) {
 					// try to resolve hostname
 					$tmp = new stdClass();