Describe the bug

Deleting files and then clicking the "Delete" button again during the process causes errors.

Steps to reproduce

1. Upload 100 files
2. Select all of them
3. Hit "Delete"
4. Hit "Delete" again during the process

Expected behavior

No error messages. Either the delete button should be disabled for the resources in the delete queue, or the deleted files should immediately disappear from the files list.

Actual behavior

The UI gets flooded with error messages.