Vaadin TypeError

My Vaadin 14 app occasionally displays the following message in a modal dialog box

vaadin TypeError: this._expandedButton is null

Has anyone else seen this? And does anyone have any thoughts or ideas as to the cause?


This looks like [this issue]
(, the fix was included in vaadin-menu-bar-flow 1.0.3 which will be included in next maintenance release of Vaadin 14.1 and the upcoming 14.2.


we have released [Vaadin 14.1.27]
( with this fix in place.