diff --git a/README.md b/README.md
index 96ec3c7..5e6142f 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,9 @@
 
 ## Changelog ##
 
+### 0.6.3 ###
+* Fixed notice in widget helper
+
 ### 0.6.1 ###
 * Fixed non existing product in order reminder
 
diff --git a/includes/class-lipscore-widget-helper.php b/includes/class-lipscore-widget-helper.php
index c8e7755..64a97fd 100644
--- a/includes/class-lipscore-widget-helper.php
+++ b/includes/class-lipscore-widget-helper.php
@@ -36,7 +36,7 @@ public function richsnippet_product_attrs( $productData ) {
     protected function to_string( $attrs ) {
         $strAttrs = array();
         foreach ($attrs as $attr => $value) {
-            $value = htmlspecialchars( $value );
+            $value = htmlspecialchars( (string) $value );
             $strAttrs[] = "$attr=\"$value\"";
         }
         return implode( ' ', $strAttrs );
diff --git a/lipscore.php b/lipscore.php
index 8a844ab..af457a8 100644
--- a/lipscore.php
+++ b/lipscore.php
@@ -8,7 +8,7 @@
  * Plugin Name: Lipscore Ratings and Reviews
  * Plugin URI:  http://lipscore.com/
  * Description: Collecting reviews is difficult. Let the most efficient and flexible plugin in the world do it for you.
- * Version:     0.6.2
+ * Version:     0.6.3
  * Author:      Lipscore
  * Author URI:  http://lipscore.com/
  * Donate link: http://lipscore.com/