diff --git a/Stdlib/Queue/PriorityQueue.php b/Stdlib/Queue/PriorityQueue.php
index 44d32991d..bfeddbf88 100644
--- a/Stdlib/Queue/PriorityQueue.php
+++ b/Stdlib/Queue/PriorityQueue.php
@@ -192,11 +192,9 @@ class PriorityQueue implements \Countable, \Serializable
      *
      * @param string $data Data to unserialze
      *
-     * @return array
-     *
      * @since  1.0.0
      */
-    public function unserialize($data) : array
+    public function unserialize($data)
     {
         $this->queue = json_decode($data);
         $this->count = count($this->queue);
diff --git a/System/SystemUtils.php b/System/SystemUtils.php
index af82bd0e7..b665200dc 100644
--- a/System/SystemUtils.php
+++ b/System/SystemUtils.php
@@ -49,6 +49,7 @@ class SystemUtils
         $mem = 0;
 
         if (stristr(PHP_OS, 'WIN')) {
+            $mem = null;
             exec('wmic memorychip get capacity', $mem);
             
             /** @var array $mem */
@@ -107,6 +108,7 @@ class SystemUtils
         $cpuusage = 0;
 
         if (stristr(PHP_OS, 'WIN') !== false) {
+            $cpuusage = null;
             exec('wmic cpu get LoadPercentage', $cpuusage);
             $cpuusage = $cpuusage[1];
         } elseif (stristr(PHP_OS, 'LINUX') !== false) {