录音文件读取失败...

我的录音文件播放都是在最后一秒的时候报错.
播放音频文件：1489731815267.amr at recordDetail.html:271
[object Object]======_doc/camera/1489731815267.amr at recordDetail.html:286
00:00:01/00:00:08 at recordDetail.html:312
00:00:02/00:00:08 at recordDetail.html:312
00:00:03/00:00:08 at recordDetail.html:312
00:00:04/00:00:08 at recordDetail.html:312
00:00:05/00:00:08 at recordDetail.html:312
00:00:06/00:00:08 at recordDetail.html:312
TypeError: Cannot read property 'innerText' of null
什么原因?????