diff --git a/app/code/core/Mage/Eav/Model/Entity/Abstract.php b/app/code/core/Mage/Eav/Model/Entity/Abstract.php
index 7b7b76e4479..5a35eebdab7 100644
--- a/app/code/core/Mage/Eav/Model/Entity/Abstract.php
+++ b/app/code/core/Mage/Eav/Model/Entity/Abstract.php
@@ -979,7 +979,12 @@ protected function _loadModelAttributes($object)
         $selectGroups = $helper->getLoadAttributesSelectGroups($selects);
         foreach ($selectGroups as $selects) {
             if (!empty($selects)) {
-                $select = $this->_prepareLoadSelect($selects);
+                if (is_array($selects)) {
+                    $select = $this->_prepareLoadSelect($selects);
+                } else {
+                    $select = $selects;
+                }
+                
                 $values = $this->_getReadAdapter()->fetchAll($select);
                 foreach ($values as $valueRow) {
                     $this->_setAttributeValue($object, $valueRow);
diff --git a/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php b/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php
index 4c361808ac1..bcd055b7d4f 100644
--- a/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php
+++ b/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php
@@ -1120,7 +1120,12 @@ public function _loadAttributes($printQuery = false, $logQuery = false)
         foreach ($selectGroups as $selects) {
             if (!empty($selects)) {
                 try {
-                    $select = implode(' UNION ALL ', $selects);
+                    if (is_array($selects)) {
+                        $select = implode(' UNION ALL ', $selects);
+                    } else {
+                        $select = $selects;
+                    }
+                    
                     $values = $this->getConnection()->fetchAll($select);
                 } catch (Exception $e) {
                     Mage::printException($e, $select);
diff --git a/app/code/core/Mage/Eav/Model/Resource/Helper/Mysql4.php b/app/code/core/Mage/Eav/Model/Resource/Helper/Mysql4.php
index 3321bd11925..2dc4eaf2533 100644
--- a/app/code/core/Mage/Eav/Model/Resource/Helper/Mysql4.php
+++ b/app/code/core/Mage/Eav/Model/Resource/Helper/Mysql4.php
@@ -108,7 +108,7 @@ public function getLoadAttributesSelectGroups($selects)
         foreach ($selects as $eavType => $selectGroup) {
             $mainGroup = array_merge($mainGroup, $selectGroup);
         }
-        return [$mainGroup];
+        return $mainGroup;
     }
 
     /**