Error: read ECONNRESET when resizing image in Storage about functions-samples HOT 6 CLOSED

exports.myFunction =
    functions
    .database
    .ref('...')
    .onWrite(event => {
        
        ...

        // Create thumbnails
        createThumbnail(1, ...);
        createThumbnail(2, ...);
        createThumbnail(3, ...);

         ...

        return; // <- Is this necessary ?
    });

function createThumbnail(...) {

    ...

    return bucket
        .file(originalFilepath)
        .download({
            destination: tempFilePath
        })
        .then(() => {
           
            ...

            // Generate a thumbnail using ImageMagick.
            return spawn('convert', [tempFilePath, '-thumbnail', dimension + 'x' + dimension + '>', tempFilePath])
                .then(() => {
                    
                    ....

                    // Uploading the thumbnail.
                    return bucket.upload(tempFilePath, {
                            destination: thumbnailUrl
                        })
                        .then(() => {

                              ...

                            // Save thumbnailUrl in database
                            return admin.database().ref(...).set(thumbnailUrl);
                        });
                });
        });
}