diff --git a/src/system/modules/metamodels/ContentMetaModelFrontendFilter.php b/src/system/modules/metamodels/ContentMetaModelFrontendFilter.php
index f737df83f..cb0911204 100644
--- a/src/system/modules/metamodels/ContentMetaModelFrontendFilter.php
+++ b/src/system/modules/metamodels/ContentMetaModelFrontendFilter.php
@@ -53,7 +53,7 @@ public function generate()
 
 
 	/**
-	 * Generate the module
+	 * Generate the content element
 	 */
 	protected function compile()
 	{
@@ -64,7 +64,7 @@ protected function compile()
 		// sort filters
 		$arrSort = deserialize($this->metamodel_fef_params);
 
-		foreach($arrSort as $intKeySort=>$strValSort)
+		foreach((array)$arrSort as $intKeySort=>$strValSort)
 		{
 			foreach($arrFilter['filter'] as $arrFilterDef)
 			{
diff --git a/src/system/modules/metamodels/ModuleMetaModelFrontendFilter.php b/src/system/modules/metamodels/ModuleMetaModelFrontendFilter.php
index 78d73bddd..777bf0e51 100644
--- a/src/system/modules/metamodels/ModuleMetaModelFrontendFilter.php
+++ b/src/system/modules/metamodels/ModuleMetaModelFrontendFilter.php
@@ -66,7 +66,7 @@ protected function compile()
 		// sort filters
 		$arrSort = deserialize($this->metamodel_fef_params);
 
-		foreach($arrSort as $intKeySort=>$strValSort)
+		foreach((array)$arrSort as $intKeySort=>$strValSort)
 		{
 			foreach($arrFilter['filter'] as $arrFilterDef)
 			{
@@ -87,6 +87,5 @@ protected function compile()
 		$this->Template->filters = $arrFilter['filterSorted'];
 		$this->Template->submit = $arrFilter['submit'];
 	}
-
 }