[Plugin: NextGEN Gallery] Bug Report (Wrong determination of file extension)

NextGEN Gallery Version 1.6.2
As i see, this problem is occurring in 1.7.3 version also.
There is problem with determination of file extension.

For example – you have PNG image, but it is renamed to JPG extension.

Go to “Add Gallery / Images”:

If you trying to upload this image, you will get warnings (shown below), and in result image will be wrong uploaded, and you will be not able to edit its thumbnail.

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /home/webuser/vhosts/vh121/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 198

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: '/home/webuser/vhosts/vh121/wp-content/gallery/burton-us-open/curr_cond_bg.jpg' is not a valid JPEG file in /home/webuser/vhosts/vh121/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 198
curr_cond_bg.jpg (Error : Create Image failed. Check memory limit)

Solution:
File: lib/gd.thumbnail.inc.php
Line: 145
Replace the following code:
http://wordpress.pastebin.com/iUv7psP2
to code:
http://wordpress.pastebin.com/GRQrnvPN

Or you can download patch here:
http://www.2shared.com/file/RHQPy-4L/wrong_format.html