WhiteSpace Control error

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  value: 'abc\ntest here\nAlso here',
  values: Ember.computed('value', function(){
    return (this.get('value') || '').split('\n');
  })
});

helpers.highlight-text.js

import Ember from 'ember';

export function highlightText(params, {value = '', highlight = ''}) {
		if (!value || Ember.isBlank(highlight)) {
			return Ember.String.htmlSafe(value || '');
		}

	let regexp = new RegExp(`(${highlight})`, 'gim');
	let result = (value || '').toString().replace(regexp, '<b class="highlight">$1</b>');
	return Ember.String.htmlSafe(result);
}

export default Ember.Helper.helper(highlightText);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<h2>If you remove/add some line in the textarea, it will crash, but if you remove ~ from {{each}} helper, won't crash</h2>
<br>

{{#each values as |value|~}}
  {{highlight-text value=value highlight='a'}}
{{~/each}}
<br>
{{textarea value=value rows="4"}}

{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.6.0-beta.1",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}