Index: branches/5.3.x/core/kernel/utility/ProcessBuilder.php
===================================================================
--- branches/5.3.x/core/kernel/utility/ProcessBuilder.php
+++ branches/5.3.x/core/kernel/utility/ProcessBuilder.php
@@ -74,7 +74,7 @@
 	 *
 	 * @var array
 	 */
-	protected $options = array();
+	protected $options;
 
 	/**
 	 * Creates class instance.
@@ -110,18 +110,20 @@
 	/**
 	 * Resets state to allow building another process.
 	 *
-	 * @return void
+	 * @return static
 	 */
 	public function reset()
 	{
-		$this->command = '';
-		$this->executable = '';
+		$this->command = null;
+		$this->executable = null;
 		$this->arguments = array();
 		$this->workingDirectory = null;
 		$this->env = array();
 		$this->input = null;
 		$this->timeout = 60;
 		$this->options = array();
+
+		return $this;
 	}
 
 	/**