ROM shortcuts can't be deleted if there is a special character in game name

I uploaded a game ROM and gave it a name with a special character (eg. "é" or "à").
I could not delete the game later on via steam buddy.
If I select "Delete" I get a web with an error as response:
"Error: 500 Internal Server Error
Sorry, the requested URL 'http://gameros-sbc.local/shortcuts/delete' caused an error:
Internal Server Error"

Reproduce the issue in Steam Buddy by uploading a ROM with a name such as “é” or “à”, then selecting Delete and inspect the /shortcuts/delete entry point and its 500 response. Done means shortcuts for ROMs with special characters can be deleted successfully without an internal server error.

Written by the indexing model from the issue text.