BGBucket images uploaded as "undefined"

[Caiyuo]

Haven't been able to find a pattern to this, but every once in awhile during image uploads some images will fail and get listed as "undefined" along with all the images that worked. While uploading a set, here were 3 that did this along with one that worked in case there's an obvious difference:

Undefined:

Spoiler: show

Working:

Spoiler: show

[Ragns]

Happened to me once or twice since Maguspk contributed his mass uploader. I didn't bother much since it happens so rarely and uploading again seem to fix the problem.

[Gulkeeva]

There are 2 different unidentified.

1 = Image was not processed properly (such as mass "image compression tools) and when uploaded comes up unidentified, re-encoding images fixes it.
2 = If the image takes too long to upload, it comes up unidentified (happens alot if a random large res image takes like 30sec to upload, when I mass upload pics, since I usually do like 25 at a time)

I see it once in awhile, considering I upload a lot of pics *cough*, ponies are to blame