Why some runtime JS errors are not displayed in the console?

Hello,
In my Laravel 5.8/vuejs 2.6 app I found situations when having some runtime JS errors in my console these errors are not displayed in the console,
but app flow is just just stopped. One of such errors is below in addForumPost method :

<script>
    import {bus} from '../../../app';
    import appMixin from '../../../appMixin';
    import {focus} from 'vue-focus';
    import Vue from 'vue';
    import {retrieveAppDictionaries, getModalCalculatedHeight,...

Code (JavaScript):

Why some runtime JS errors are not displayed in the console?

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