Error showing popup modal

Expected behavior No errors Actual behavior Opening modal programaticaly creates an error in console and modal is not functional. Closing modal makes rest of the application non responsive.

Resources (screenshots, code snippets etc.) Console error

ERROR Error: Uncaught (in promise): SyntaxError: Failed to execute 'add' on 'DOMTokenList': The token provided must not be empty.
Error: Failed to execute 'add' on 'DOMTokenList': The token provided must not be empty.
    at DefaultDomRenderer2.push../node_modules/@angular/platform-browser/fesm5/platform-browser.js.DefaultDomRenderer2.addClass (platform-browser.js:1112)
    at BaseAnimationRenderer.push../node_modules/@angular/platform-browser/fesm5/animations.js.BaseAnimationRenderer.addClass (animations.js:239)
    at DebugRenderer2.push../node_modules/@angular/core/fesm5/core.js.DebugRenderer2.addClass (core.js:24320)
    at ModalContainerComponent.push../node_modules/ng-uikit-pro-standard/fesm5/ng-uikit-pro-standard.js.ModalContainerComponent.updateContainerClass (ng-uikit-pro-standard.js:7209)
    at ModalContainerComponent.push../node_modules/ng-uikit-pro-standard/fesm5/ng-uikit-pro-standard.js.ModalContainerComponent.ngOnInit (ng-uikit-pro-standard.js:7190)
    at checkAndUpdateDirectiveInline (core.js:22099)
    at checkAndUpdateNodeInline (core.js:23363)
    at checkAndUpdateNode (core.js:23325)
    at debugCheckAndUpdateNode (core.js:23959)
    at debugCheckDirectivesFn (core.js:23919)
    at resolvePromise (zone.js:852)
    at new ZoneAwarePromise (zone.js:934)
    at push../src/app/components/feed/feed-tumblr-item/feed-tumblr-item.component.ts.__awaiter (feed-tab-feed-tab-module.js:336)
    at FeedTumblrItemComponent.push../src/app/components/feed/feed-tumblr-item/feed-tumblr-item.component.ts.FeedTumblrItemComponent.showShareModal (feed-tumblr-item.component.ts:108)
    at Object.eval [as handleEvent] (FeedTumblrItemComponent.html:77)
    at handleEvent (core.js:23107)
    at callWithDebugContext (core.js:24177)
    at Object.debugHandleEvent [as handleEvent] (core.js:23904)
    at dispatchEvent (core.js:20556)
    at core.js:21003

Creating modal

async showShareModal() {
    Log.debug('show modal');
    this.modalRef = this.modalService.show(ShareToBlogComponent, {
        backdrop: true,
        keyboard: true,
        focus: true,
        show: false,
        ignoreBackdropClick: false,
        class: 'modal-dialog-scrollable modal-full-height modal-right opacity80 ',
        containerClass: ' right',
        animated: true,
        data: this.feedItem
    });
    const that = this;
    this.modalRef.content.close.subscribe(close => {
        if (close) {
            this.modalRef.hide;
        }
    });
    this.modalRef.content.action.subscribe(res => {
        this.loaderSrv.createLoader('publishing post...');
        Log.debug('modal result ', res);
        if (isArray(res)) {
            res.forEach(blog => {
                Log.debug('adding post', that.feedItem, blog);
                that.blogPostSrv
                    .addFeedItemToBlog(that.feedItem, blog.id)
                    .then(published => {
                        Log.debug('published item ', published);
                        this.toastCtrl.success('Published to blog ');
                        this.modalRef.hide();
                        this.loaderSrv.dismiss();
                    })
                    .catch(error => {
                        this.toastCtrl.error(error);
                        this.loaderSrv.dismiss();
                    }).finally( () => {
                        this.loaderSrv.dismiss();
                    });
            });
        }
    }, error => {
        Log.error('Error subscribing to event ', error);
        this.loaderSrv.dismiss();
    });
}