indexedDB中的升级事件处理程序错误导致版本更改事务中止

我正在尝试使用IndexedDB创建两个对象存储，并将数据存储在其中。第一个对象存储是用数据创建的，但在创建第二个对象存储并存储数据后，处理程序在出现错误并检查evt.srcElement-->IDOpenDBRequest-->错误时转到：DOM错误，消息："Version Change Transaction was aborted in upgraded event handler"，名称："ABortError"

    var indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB ||     window.msIndexedDB;
var IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction;
var db;
 var request = indexedDB.open("xxMobileDB", 1);  
         request.onsuccess = function (evt) {
             db = request.result;
             var version = parseInt(db.version);
             db.close();
             var request1 = indexedDB.open("xxMobileDB", version + 1);
             request1.onupgradeneeded = function (evt)
             {
                 var objectBOMStore = evt.currentTarget.result.createObjectStore(
                         "BOM", { keyPath: "PackNumber", autoIncrement: true });
                 objectBOMStore.createIndex("PackNumber", "PackNumber", { unique: false });
                 for (var i = 0; i < BOMData.length; i++)
                 {
                     var obj = BOMData[i];
                     objectBOMStore.add(obj);
                 }
             };
             request1.onsuccess = function (evt)
             {
                 evt.target.result.close();
             };
             request1.onerror = function (evt) {
                 console.log("IndexedDB error: " + evt.target.errorCode);
             };
         };
         request.onerror = function (evt) {
             console.log("IndexedDB error: " + evt.target.errorCode);
         };
         request.onupgradeneeded = function (evt)
         {
             var objectStore = evt.currentTarget.result.createObjectStore(
                      "Pack", { keyPath: "PackId", autoIncrement: true });
             objectStore.createIndex("PackId", "PackId", { unique: true });
             for (var i = 0; i < packData.length; i++)
             {
                 var obj = packData[i];
                 objectStore.add(obj);
             }

         };

填充objectBOMStore后，代码进入request1.error。创建的对象存储包没有任何错误，我可以在Chrome-->Resources->IndexedDB