diff --git a/classes/ObjectModel.php b/classes/ObjectModel.php
index 17ba854d6..ebe12dc1c 100644
--- a/classes/ObjectModel.php
+++ b/classes/ObjectModel.php
@@ -940,8 +940,8 @@ abstract class ObjectModelCore
 	{
 		global $_FIELDS;
 
-		if (file_exists(_PS_TRANSLATIONS_DIR_.Context::getContext()->language->iso_code.'/fields.php'))
-			include(_PS_TRANSLATIONS_DIR_.Context::getContext()->language->iso_code.'/fields.php');
+		if ($_FIELDS === null && file_exists(_PS_TRANSLATIONS_DIR_.Context::getContext()->language->iso_code.'/fields.php'))
+			include_once(_PS_TRANSLATIONS_DIR_.Context::getContext()->language->iso_code.'/fields.php');
 
 		$key = $class.'_'.md5($field);
 		return ((is_array($_FIELDS) && array_key_exists($key, $_FIELDS)) ? ($htmlentities ? htmlentities($_FIELDS[$key], ENT_QUOTES, 'utf-8') : $_FIELDS[$key]) : $field);
@@ -1596,4 +1596,4 @@ abstract class ObjectModelCore
 	{
 		$this->update_fields = $fields;
 	}
-}
+}
\ No newline at end of file