Umbraco 8.0, while the process of Tinifying images on upload runs redirect between folders throws an error

[mykhailomoskalov]

Umbraco version 8.0 Tinifier 2.0.1

Preconditions:

1. Enable option 'Tinify on upload'

Steps to reproduce:

1. Download a bunch of images to [Folder1]
2. While downloading images is in the process redirect to [Folder2]
3. Download images to the folder
4. Redirect between folders forth and back

Actual result:

1. The system throws error 'Server error: Contact administrator, see log for full details.
   Failed to retrieve allowed types for media id 1179'

Expected result:

1. Redirect between folders should work correctly and without any errors