diff --git a/backend/lib/Model/Aggregator.php b/backend/lib/Model/Aggregator.php
index 2a78ee0..2abf6b5 100644
--- a/backend/lib/Model/Aggregator.php
+++ b/backend/lib/Model/Aggregator.php
@@ -55,7 +55,6 @@ class Aggregator extends Entity {
 	public function __construct($properties = array()) {
 		parent::__construct($properties);
 
-		$this->channels = new ArrayCollection();
 		$this->children = new ArrayCollection();
 	}
 
@@ -120,4 +119,4 @@ class Aggregator extends Entity {
 }
 
 
-?>
\ No newline at end of file
+?>
diff --git a/backend/lib/Model/Channel.php b/backend/lib/Model/Channel.php
index 0384fcd..cd3697f 100644
--- a/backend/lib/Model/Channel.php
+++ b/backend/lib/Model/Channel.php
@@ -40,9 +40,6 @@ class Channel extends Entity {
 	 */
 	protected $data = NULL;
 
-	/** @ManyToMany(targetEntity="Aggregator", mappedBy="channels") */
-	protected $aggregators;
-
 	/**
 	 * Constructor
 	 */
diff --git a/backend/lib/Model/Entity.php b/backend/lib/Model/Entity.php
index 0934d03..915419d 100644
--- a/backend/lib/Model/Entity.php
+++ b/backend/lib/Model/Entity.php
@@ -109,7 +109,7 @@ abstract class Entity {
 		}
 
 		if (count($invalidProperties) > 0) {
-			throw new \Exception('Propert' . ((count($invalidProperties) == 1) ? 'y' : 'ies') . ' "' . implode(', ', $unallowedProperties) . '" ' . ((count($unallowedProperties) == 1) ? 'is' : 'are') . ' not allowed for entity "' . $this->getType() . '"');
+			throw new \Exception('Propert' . ((count($invalidProperties) == 1) ? 'y' : 'ies') . ' "' . implode(', ', $invalidProperties) . '" ' . ((count($invalidProperties) == 1) ? 'is' : 'are') . ' not allowed for entity "' . $this->getType() . '"');
 		}
 	}
 
diff --git a/backend/lib/Model/Proxy/VolkszaehlerModelChannelProxy.php b/backend/lib/Model/Proxy/VolkszaehlerModelChannelProxy.php
index 8d8c664..6db8f44 100644
--- a/backend/lib/Model/Proxy/VolkszaehlerModelChannelProxy.php
+++ b/backend/lib/Model/Proxy/VolkszaehlerModelChannelProxy.php
@@ -96,6 +96,6 @@ class VolkszaehlerModelChannelProxy extends \Volkszaehler\Model\Channel implemen
 
     public function __sleep()
     {
-        return array('__isInitialized__', 'id', 'uuid', 'type', 'tokens', 'properties', 'parents', 'data', 'aggregators');
+        return array('__isInitialized__', 'id', 'uuid', 'type', 'tokens', 'properties', 'parents', 'data');
     }
 }
\ No newline at end of file
diff --git a/backend/lib/Router.php b/backend/lib/Router.php
index 7d3db11..b220e60 100644
--- a/backend/lib/Router.php
+++ b/backend/lib/Router.php
@@ -144,7 +144,7 @@ class Router {
 	 */
 	public function run() {
 		$pathInfo = substr($this->pathInfo, 1, strrpos($this->pathInfo, '.') -1);	// remove leading slash and format
-		$pathInfo = explode('/', $pathInfo);										// split into path segments
+		$pathInfo = explode('/', $pathInfo);						// split into path segments
 
 		if (array_key_exists($pathInfo[0], self::$controllerMapping)) {
 			$class = self::$controllerMapping[$pathInfo[0]];
@@ -226,4 +226,4 @@ class Router {
 	}
 }
 
-?>
\ No newline at end of file
+?>