File upload with busboy sometimes does not send response in error case

Question

I want to stream an uploaded file with busboy to another server. Doing that I stumbled into strange behavior in error case.

The real application code is in NestJS but I could reduce it to the following in a simple express app. Here is the method from my controller:

app.post("/", (req, res) => {
  const bb = busboy({ headers: req.headers });

  bb.on("file", (name, file) => {
    try {
      throw new Error('test');
      // Here would be some code that could throw an error.
    } catch (error) {
      // What do I have to do here? Something like:
      // file.destroy();
      // bb.destroy();
      // req.unpipe(bb);
      res.send('error');
    }
  });

  req.pipe(bb);
});

When I upload small files, it works as expected, but when I upload a file of about 10MB it sometimes doesn't send a response. I suspect that the stream isn't properly closed and I commented some code above which I tried but didn't work.

Can someone make sense of it, that it only sometimes doesn't work? And how can I solve it/close the stream properly?