fixed COPY record in TableAjax

SE/se-lib/Data_Source.php

@@ -90,6 +90,7 @@ class Data_Source {
 	}
 
 	public function getUniqueKeys() {
+		$tblName = $this->_tbl;
 		$allKeys = DB::getPDO($this->_idDatabase)->fetchAll("
 			SHOW KEYS FROM  `{$tblName}`
 		");