Flickr causes crashes with Aperture
There's is a cooler solution if you are a bit into computers.
You can create an automator script and link it with Aperture. When the connection with flickr is opened, the script will disable sleep on while uploads are pending. Or similar. Google for "pmset", "sleep", "mac", "automator", "script" etc.
|_F0A5334-Edit_small by Dester Wallaboo|
from Open Air Fashion Photography
|Feed me, me, me, me, me by Denjw|
from Attention-Seekers in Nature