To reproduce:

• have an IMAP account missing a common folder, e.g. Trash
• use sourcehut with the 'alps' theme configured

Expected behaviour:

• mailbox page renders correctly

Actual behaviour:

• mailbox page crashes

This is happening because there is an assumption built into themes/alps/util.html that all the common mailboxes are present. Some mail servers (maddy.email in this case) do not automatically include a Trash folder.