Index: pollfield.module
===================================================================
--- pollfield.module	(revision 6748)
+++ pollfield.module	(working copy)
@@ -1030,7 +1030,7 @@
     // get where is table
     // get table
     $fields = content_fields();
-    $db_info = content_database_info($fields[$field_name]);
+    $db_info = content_database_info($fields[$pollfield->field_name]);
     $table_content = $db_info['table'];
     $column = 'delta';
     $is_delta_exist = db_column_exists($table_content, $column);