diff --git a/class/Common/Sql/Table.php b/class/Common/Sql/Table.php
index 11a85863..c2185cda 100644
--- a/class/Common/Sql/Table.php
+++ b/class/Common/Sql/Table.php
@@ -673,6 +673,7 @@ public function get_structure_info( $table, $table_structure = array(), $state_d
 		$points             = array();
 		$field_set          = array();
         $this->primary_keys = array();
+        $this->first_select = null;
 		$use_primary_keys   = true;
 
 		foreach ( $table_structure as $struct ) {