Error with mkdir() call

Hello. In our case we have many files uploade and use uploadpath module so imagecache have to do mkdir() for already ready directory.

So we get warning
mkdir() [function.mkdir]: File exists в файле /home/xxxxxxxxx/www/sites/all/modules/imagecache/imagecache.module at line 601.

I think there must be added @ before mkdir() to suppress this warning.