diff --git a/classes/Tools.php b/classes/Tools.php
index 8ec0b5ac0..665eece20 100644
--- a/classes/Tools.php
+++ b/classes/Tools.php
@@ -644,14 +644,14 @@ class ToolsCore
 	{
 		if (is_array($string))
 			return array_map(array('Tools', 'htmlentitiesUTF8'), $string);
-		return htmlentities($string, $type, 'utf-8');
+		return htmlentities((string)$string, $type, 'utf-8');
 	}
 
 	public static function htmlentitiesDecodeUTF8($string)
 	{
 		if (is_array($string))
 			return array_map(array('Tools', 'htmlentitiesDecodeUTF8'), $string);
-		return html_entity_decode($string, ENT_QUOTES, 'utf-8');
+		return html_entity_decode((string)$string, ENT_QUOTES, 'utf-8');
 	}
 
 	public static function safePostVars()