Comment 3 for bug 1887913

I literally have no idea what "stderr is missing" means.

This is 'stderr':
* sb-sys:*stderr*
#<SB-SYS:FD-STREAM for "standard error" {1001598163}>
It can't become 'missing'.

For lack of anything better to say about this, try putting a handler-bind around forms that might generate lisp conditions which you don't want to propagate outside of that form.