smushit error when file not on server

I am hosting with WPengine and largeFS set up to move my images off the server and onto Amazon S3. It seems that there is an error with the get_file_type function when the file is not on the server, it returns an error.

class-wp-smush-nextgen.php on line 88

That is, I am using nextgen gallery plugin and the thumbnails are not showing up because of this error.

see example: https://signatureretirementliving.com/property/pearl-and-pine/