991e8f9 created the issue

Hi,
I just downloaded the newest version and began to upload my files to my server.
But after it's finished uploading, a message will pop up says: "I/O Error: Upload failed unexpected null reply" and it also has 2 buttons of "try again" or "cancel". If I click "try again" then it will try to upload the process again and the message will pop up again! But if I click "cancel" then everything is fine and it also says "upload complete".
I checked whether all the files have been uploaded and everything seems to be fine.
so I dont get why that message window pops up after uploading process is done.
Is it something wrong or some type of bug perhaps?
Please let me know soon,
Thanks,
Mike