Gulp4, gulp-imacss and Deprecation Warning

Question

I study work with Gulp 4 and use plugin 'gulp-imacss' and other

var imacss = require('gulp-imacss')

farther

var imguri = {
        in: source + 'images/inline/*',
        out: source + 'scss/images/',
        filename: '_datauri.scss',
        namespace: 'img'
    }

create task that convert images to dataURIs in SCSS source

gulp.task('imguri', function () {
    return gulp.src(imguri.in)
        .pipe(imagemin())
        .pipe(imacss(imguri.filename, imguri.namespace))
        .pipe(gulp.dest(imguri.out))
});

Run gulp imguri in terminal and get:

Starting 'imguri'...

(node:90037) [DEP0097] DeprecationWarning: Using a domain property in MakeCallback is deprecated. Use the async_context variant of MakeCallback or the AsyncResource class instead.

The following tasks did not complete: imguri

Did you forget to signal async completion?

I don't understand what to do with the code because of this Deprecation Warning.