User avatars causing getimagesize errors

[Dinocanid]

Some user's avatars cause errors like this one:

Warning: getimagesize(http://rs858.pbsrc.com/albums/ab148/SuperNyappyOfLove/Kawaii Stuff/Pixels/pixel_gato_04.gif~c200): failed to open stream: HTTP request failed! HTTP/1.1 500 Internal Server Error in /home/foodbabs/public_html/classes/class_image.php on line 114

Does it have something to do with the given URL?