buildImage hangs if called multiple times

[ChristopherHButler]

I am getting errors with buildImage where it hangs indefinitely for no apparent reason when called the second or third time. I can give maintainers access to my github repo to reproduce or provide any information required if help is available. Here is my buildImage wrapper function:

/**
 * build an image
 * @param {string} context - provides the path to the Dockerfile.
 * @param {string[]} src - Array of files involved in build. All files involved in build must be explicitly mentioned in src array.
 * @param {string} nametag - A name and optional tag to apply to the image in the name:tag format. If you omit the tag the default latest value is assumed.
 * @returns a Promise of NodeJS stream.
 */
exports.buildImage = async ({ context, src, nametag }) => {

  try {
    // hangs on this line _forever_
    const imageStream = await docker.buildImage({ context, src }, { t: nametag, openStdin: true, });

    await new Promise((resolve, reject) => {
      docker.modem.followProgress(imageStream, (err, res) => {
        if (err) {
          console.log('error building image', err);
          reject(err);
        }
        resolve(res);
      });
    });

    return imageStream;
  } catch (err) {
    throw new Error(`Error building image: `, err);
  }
};