Error: write after end

Olá,

Estou tentando rodar o gulp, mas em uma das tasks está dando o erro "write after end". Segue meu gulpfile.js:

var gulp = require('gulp'), 
    imagemin = require('gulp-imagemin'),
    clean = require('gulp-clean'),
    uglify = require('gulp-uglify'),
    usemin = require('gulp-usemin'),
    cssmin = require('gulp-clean-css'),
    rev = require('gulp-rev'),
    autoprefixer = require('gulp-autoprefixer'),
    htmlmin = require('gulp-htmlmin');

gulp.task('copy', function(){
    return gulp.src('./src/**/*')
        .pipe(gulp.dest('./min/'));
});

gulp.task('clean', function(){
    return gulp.src('./min')
        .pipe(clean());
});

gulp.task('build-img', function(){
    gulp.src('./min/imgs/*.jpg')
        .pipe(imagemin())
        .pipe(gulp.dest('./min/imgs/'));
    gulp.src('./min/imgs/*.png')
        .pipe(imagemin())
        .pipe(gulp.dest('./min/imgs/'));
});

gulp.task('minif-html', function(){
    gulp.src('./min/*.html')
        .pipe(usemin({
            js: [ uglify(), rev() ],
            css: [ autoprefixer(), cssmin(), rev() ],
            html: [htmlmin({ collapseWhitespace: true })]
        }))
        .pipe(gulp.dest('./min/'));
});

gulp.task('default', 
    gulp.series('clean', 'copy', 
        gulp.parallel('minif-html', 'build-img')));

Segue o package.json:

{
  "name": "projeto-teste",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "gulp": "gulp"
  },
  "repository": {
    "type": "git",
    "url": "git+https://gitlab.com/puzzletech/projeto-teste.git"
  },
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://gitlab.com/puzzletech/projeto-teste/issues"
  },
  "homepage": "https://gitlab.com/puzzletech/projeto-teste#readme",
  "devDependencies": {
    "gulp": "^4.0.2",
    "gulp-autoprefixer": "^7.0.1",
    "gulp-clean": "^0.4.0",
    "gulp-clean-css": "^4.3.0",
    "gulp-htmlmin": "^5.0.1",
    "gulp-imagemin": "^7.1.0",
    "gulp-rev": "^9.0.0",
    "gulp-uglify": "^3.0.2",
    "gulp-usemin": "^0.3.30",
    "gulp-useref": "^4.0.1"
  }
}

Segue o detalhamento do erro que estou recebendo:

Using gulpfile ~/Documents/xampp/www/projeto-teste/gulpfile.js
[11:35:28] Starting 'default'...
[11:35:28] Starting 'clean'...
[11:35:28] Finished 'clean' after 38 ms
[11:35:28] Starting 'copy'...
[11:35:29] Finished 'copy' after 234 ms
[11:35:29] Starting 'minif-html'...
[11:35:29] Starting 'build-img'...
[11:35:31] 'minif-html' errored after 2.21 s
[11:35:31] Error: write after end
    at writeAfterEnd (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_writable.js:288:12)
    at DestroyableTransform.Writable.write (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_writable.js:332:20)
    at DestroyableTransform.ondata (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_readable.js:619:20)
    at DestroyableTransform.emit (events.js:315:20)
    at DestroyableTransform.EventEmitter.emit (domain.js:506:15)
    at addChunk (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_readable.js:291:12)
    at readableAddChunk (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_readable.js:278:11)
    at DestroyableTransform.Readable.push (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_readable.js:245:10)
    at DestroyableTransform.Transform.push (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/readable-stream/lib/_stream_transform.js:148:32)
    at DestroyableTransform.endStream [as _flush] (/Users/renotavares/Documents/xampp/www/projeto-teste/node_modules/gulp-concat/index.js:96:10)
[11:35:31] 'default' errored after 2.49 s
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! projeto-teste1.0.0 gulp: `gulp`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the projeto-teste@1.0.0 gulp script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

Tentei pesquisar sobre o erro mas não encontrei nada que resolvesse.