Fixed #9371. MultiSQL now accepts `_id` too.

extension/Classes/Core/AbstractBuildForm.php

@@ -257,7 +257,7 @@ abstract class AbstractBuildForm {
             $this->store->setStore($row, STORE_PARENT_RECORD, true);
             $this->store->setVar(F_MULTI_COL_ID, $row[$idName], STORE_PARENT_RECORD); // In case '_id' is used, both '_id' and 'id' should be accessible.
 
-            $record = $this->dbArray[$this->dbIndexData]->sql('SELECT * FROM `' . $this->formSpec[F_TABLE_NAME] . '` WHERE `id`=' . $row[F_MULTI_COL_ID], ROW_EXPECT_1);
+            $record = $this->dbArray[$this->dbIndexData]->sql('SELECT * FROM `' . $this->formSpec[F_TABLE_NAME] . '` WHERE `id`= ?', ROW_EXPECT_1, [$row[$idName]]);
             $this->store->setStore($record, STORE_RECORD, true);
 
             $jsonTmp = array();