Exception when clicking on empty area in paper

[anssit]

Steps to reproduce

1. Open a design with e.g. a single vaadin-button.
2. Click anywhere on the paper, except on the button.

Actual behavior

Browser console shows exception:

Uncaught TypeError: Cannot read property 'childNodes' of null
    at HTMLElement._textNodeFromPoint (vaadin-designer-paper.js:434)
    at HTMLElement._resolveElementFromEvent (vaadin-designer-paper.js:416)
    at HTMLElement._findTargetElement (vaadin-designer-paper.js:396)
    at HTMLElement._clickHandler (vaadin-designer-paper.js:362)
    at HTMLElement._preventClickInteraction (vaadin-designer-paper.js:306)
_textNodeFromPoint @ vaadin-designer-paper.js:434
_resolveElementFromEvent @ vaadin-designer-paper.js:416
_findTargetElement @ vaadin-designer-paper.js:396
_clickHandler @ vaadin-designer-paper.js:362
_preventClickInteraction @ vaadin-designer-paper.js:306

Otherwise seems to work as expected.

Expected behavior

No exception in console.

IDE, Designer and OS version

4.6.7