Causing Issues with WP Uploader

Hello,
I’ve recently been having issues uploading images and have narrowed it down to the recent WP 3.8.1 update and your Media Rename plugin.
Deactivating this specific plugin resolves the issue, but would like to re-enable for use in my instance.

When I go to upload a file through the Media Uploader it looks like it gets to 100% and then the error message is displayed:
An error occurred in the upload. Please try again later.

Looking into the debug.log I found an error associated with this plugin:
[24-Jan-2014 11:08:03 UTC] PHP Notice: Undefined index: post in /usr/www/users/fredf/myvancity/wp-content/plugins/media-rename/class-media-rename.php on line 37

Any assistance appreciated,
Cheers

http://wordpress.org/plugins/media-rename/