As title, basically - some shortened URLs via Skimlinks are correctly expanded, but others return the root URL and then CLIENT_ERROR. The troublesome URL that I noticed this with:

https://fave.co/3O64Jh9 -> https://www.razer.com/gaming-keyboards/Razer-DeathStalker-V2-Pro-Tenkeyless/RZ03-04373500-R3M1?irclickid=TCVQyR3kfxyNRw2xKQ3XYSymUkDSpdztGVDRQY0&irgwc=1&utm_source=Skimbit%20Ltd.&utm_medium=affiliate&utm_content=10078&utm_term=Skimbit%20Ltd.&utm_sharedid=eurogamer.net&cid=Skimbit%20Ltd.-affiliate

It's quite a long URL, but even without the affiliate stuff it still doesn't work.

>> urlexpander.expand('https://fave.co/3O64Jh9')
'http://razer.com/__CLIENT_ERROR__'
>> urlexpander.expand('https://www.razer.com/gaming-keyboards/Razer-DeathStalker-V2-Pro-Tenkeyless/RZ03-04373500-R3M1')
'http://razer.com/__CLIENT_ERROR__'