Spamming the activate button to download a resource pack triggers an error

Spamming the activate button to download a resource pack triggers an error.

How to reproduce:

1. Delete a resource pack
2. Go to create new world
3. Spam the activate button on the deleted pack
4. Download the pack
5. Observe the error message on-screen

Observed results: It triggers an error

Expected results: It should not trigger an error