Two Sass Sourcemaps in One Gulp Stream - sass

Question

I created a Gulp task, styles, that creates minified and non-minified CSS files from Sass files. I would like to also create minified and non-minified Sourcemaps, however, this doesn't appear to be working.
Here is the code:
// Compile Sass, Autoprefix and minify
gulp.task('styles', function() {
return gulp.src('./assets/scss/**/*.scss')
.pipe(plumber(function(error) {
gutil.log(gutil.colors.red(error.message));
this.emit('end');
}))
.pipe(sourcemaps.init()) // Start Sourcemaps
.pipe(sass())
.pipe(autoprefixer({
browsers: ['last 2 versions'],
cascade: false
}))
.pipe(sourcemaps.write('../maps'))
.pipe(gulp.dest('./assets/css/')) // Create sourcemap
.pipe(rename({suffix: '.min'}))
.pipe(cssnano())
.pipe(sourcemaps.write('../maps')) // Create minified sourcemap
.pipe(gulp.dest('./assets/css/'))
});
Currently, this throws an error and doesn't create the minified sourcemap. However, if I remove one of the sourcemap.write instances, then it works completely fine.
Is it possible to create two sourcemaps in one stream?

Answer 1

How about implementing something like this?
https://github.com/ben-eb/gulp-cssnano/issues/21
Edit: My attempt from the above link.. I got this to run without any errors.
// Grab our gulp packages
var gulp = require('gulp'),
gutil = require('gulp-util'),
sass = require('gulp-sass'),
cssnano = require('gulp-cssnano'),
autoprefixer = require('gulp-autoprefixer'),
sourcemaps = require('gulp-sourcemaps'),
jshint = require('gulp-jshint'),
stylish = require('jshint-stylish'),
uglify = require('gulp-uglify'),
concat = require('gulp-concat'),
rename = require('gulp-rename'),
plumber = require('gulp-plumber'),
bower = require('gulp-bower'),
merge = require('merge-stream'),
clone = require('gulp-clone'),
browserSync = require('browser-sync').create(),
clip = require('gulp-clip-empty-files');
gulp.task('styles', function() {
var source = gulp.src('./assets/scss/**/*.scss')
.pipe(plumber(function(error) {
gutil.log(gutil.colors.red(error.message));
this.emit('end');
}))
.pipe(sass())
.pipe(sourcemaps.init()) // Start Sourcemaps
.pipe(autoprefixer({
browsers: ['last 2 versions'],
cascade: false
}));
var pipe1 = source.pipe(clone())
.pipe(sourcemaps.write('../maps'))
.pipe(gulp.dest('./assets/css/')); // Create sourcemap
var pipe2 = source.pipe(clone())
.pipe(rename({suffix: '.min'}))
.pipe(cssnano())
.pipe(sourcemaps.write('../maps')) // Create minified sourcemap
.pipe(clip())
.pipe(gulp.dest('./assets/css/'));
return merge(pipe1, pipe2);
});
If like cimmanon was suggesting that you may not want to have a minified source map, just delete the
.pipe(sourcemaps.write('../maps')) // Create minified sourcemap
from
var pipe2