--- field_sql_storage.module (saved version)
+++ (current document)
@@ -676,7 +676,7 @@
  * Implements hook_field_storage_details().
  */
 function field_sql_storage_field_storage_details($field) {
-  $details = array();
+  $columns = array();
 
   // Add field columns.
   foreach ((array) $field['columns'] as $column_name => $attributes) {