###

### Steps to reproduce

* Go to [https://qa.openproject-edge.com/lookbook/inspect/primer/open\_project/tree\_view/default](https://qa.openproject-edge.com/lookbook/inspect/primer/open_project/tree_view/default)

* Try to open the first node Begin of the insertionby clicking on the little arrowEnd of the insertion


### What is the buggy behavior?

* The node does not open

* There is an error on the console


<img class="image_resized op-uc-image op-uc-image_inline" style="width:635px;" src="/api/v3/attachments/547034/content">

### What is the expected behavior?

* The node should open


###

### Environment information

**OpenProject version**

_16.1_

**Browser**

* [x] Chrome
* [ ] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [x] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)

**Language**

_German_