diff --git a/application/controllers/api/v1/crm/Prestudentstatus.php b/application/controllers/api/v1/crm/Prestudentstatus.php
index 5b19dbc61..f1bfda16a 100644
--- a/application/controllers/api/v1/crm/Prestudentstatus.php
+++ b/application/controllers/api/v1/crm/Prestudentstatus.php
@@ -55,22 +55,26 @@ class Prestudentstatus extends APIv1_Controller
 	 */
 	public function postPrestudentstatus()
 	{
-		if ($this->_validate($this->post()))
+            $prestudentstatus = $this->_parseData($this->post());
+            
+            $this->response($prestudentstatus);
+            
+		if ($this->_validate($prestudentstatus))
 		{
-			if (isset($this->post()['ausbildungssemester']) && isset($this->post()['studiensemester_kurzbz']) &&
-				isset($this->post()['status_kurzbz']) && isset($this->post()['prestudent_id']))
+			if (isset($prestudentstatus['ausbildungssemester']) && isset($prestudentstatus['studiensemester_kurzbz']) &&
+				isset($prestudentstatus['status_kurzbz']) && isset($prestudentstatus['prestudent_id']))
 			{
-				$pksArray = array($this->post()['ausbildungssemester'],
-									$this->post()['studiensemester_kurzbz'],
-									$this->post()['status_kurzbz'],
-									$this->post()['prestudent_id']
+				$pksArray = array($prestudentstatus['ausbildungssemester'],
+									$prestudentstatus['studiensemester_kurzbz'],
+									$prestudentstatus['status_kurzbz'],
+									$prestudentstatus['prestudent_id']
 								);
 				
-				$result = $this->PrestudentstatusModel->update($pksArray, $this->post());
+				$result = $this->PrestudentstatusModel->update($pksArray, $prestudentstatus);
 			}
 			else
 			{
-				$result = $this->PrestudentstatusModel->insert($this->post());
+				$result = $this->PrestudentstatusModel->insert($prestudentstatus);
 			}
 			
 			$this->response($result, REST_Controller::HTTP_OK);
diff --git a/application/controllers/api/v1/person/Kontakt.php b/application/controllers/api/v1/person/Kontakt.php
index 5d5407bf8..00015ff78 100644
--- a/application/controllers/api/v1/person/Kontakt.php
+++ b/application/controllers/api/v1/person/Kontakt.php
@@ -67,19 +67,4 @@ class Kontakt extends APIv1_Controller
 			$this->response();
 		}
     }
-    
-    private function _parseData($person)
-    {
-        if(is_array($person))
-        {
-            foreach($person as $key=>$value)
-            {
-                if($value === "")
-                {
-                    $person[$key] = null;
-                }
-            }
-            return $person;
-        }
-    }
 }
\ No newline at end of file
diff --git a/application/controllers/api/v1/person/Person.php b/application/controllers/api/v1/person/Person.php
index c0c3168ea..71edf5ef3 100644
--- a/application/controllers/api/v1/person/Person.php
+++ b/application/controllers/api/v1/person/Person.php
@@ -109,21 +109,6 @@ class Person extends APIv1_Controller
 			$this->response();
 		}
 	}
-        
-        private function _parseData($person)
-        {
-            if(is_array($person))
-            {
-                foreach($person as $key=>$value)
-                {
-                    if($value === "")
-                    {
-                        $person[$key] = null;
-                    }
-                }
-                return $person;
-            }
-        }
 
 	private function _validate($person = NULL)
 	{
diff --git a/application/core/APIv1_Controller.php b/application/core/APIv1_Controller.php
index b33c5a530..cc3d3fef8 100644
--- a/application/core/APIv1_Controller.php
+++ b/application/core/APIv1_Controller.php
@@ -4,10 +4,42 @@ require_once APPPATH . '/libraries/REST_Controller.php';
 
 class APIv1_Controller extends REST_Controller 
 {
-	function __construct()  
-	{
-        parent::__construct();
-		//$this->load->library('session'); // -> autoload
-		//$this->load->library('database'); -> autoload
+    function __construct()  
+    {
+    parent::__construct();
+            //$this->load->library('session'); // -> autoload
+            //$this->load->library('database'); -> autoload
+    
+    }
+    
+    /**
+     * 
+     * @param type $data
+     * @return typeparses empty string to NULL
+     */
+    protected function _parseData($data)
+    {
+        if(is_array($data))
+        {
+            foreach($data as $key=>$value)
+            {
+                if($value === "")
+                {
+                    $data[$key] = NULL;
+                }
+            }
+            return $data;
+        }
+        elseif(is_object($data))
+        {
+            //TODO
+        }
+        else
+        {
+            if($data == "")
+            {
+                return NULL;
+            }
+        }
     }
 }
\ No newline at end of file