diff --git a/app/code/local/Edge/AllConfigurableOptions/Block/Product/View/Type/Configurable.php b/app/code/local/Edge/AllConfigurableOptions/Block/Product/View/Type/Configurable.php
index 6af278d..5f12032 100644
--- a/app/code/local/Edge/AllConfigurableOptions/Block/Product/View/Type/Configurable.php
+++ b/app/code/local/Edge/AllConfigurableOptions/Block/Product/View/Type/Configurable.php
@@ -177,7 +177,7 @@ public function getJsonConfig()
 
     protected function _getSorts($attributeId)
     {
-        if (null === $this->_sorts[$attributeId]) {
+        if (empty($this->_sorts[$attributeId])) {
             $this->_sorts[$attributeId] = array_reduce(
                 Mage::getResourceModel('eav/entity_attribute_option_collection')
                     ->setAttributeFilter($attributeId)