ImageKit + S3: ERROR: 'NoneType' object has no attribute 'startswith'

[Fellipe Henrique]

When I try to show a image in template appears these error:  'NoneType' object has no attribute 'startswith' 

Here is my traceback: https://gist.github.com/fellipeh/dde0ad1c1a467c454a90

But, the problem is: some images works fine, some don't... and I don't figure out what's the problem in these particular images.. :(

Can any one help me?

Regards