diff --git a/build/api/module/professorController.php b/build/api/module/professorController.php
index 4a45714..b7f0b69 100644
--- a/build/api/module/professorController.php
+++ b/build/api/module/professorController.php
@@ -53,7 +53,7 @@ class professorController{
 	---------------------------------------------------------*/
 	public static function get($args){
 		$prof_id = null;
-		$with_vh = null;
+		$with_vh = '';
 		extract($args);
 
 		/* Get the professor repo */