Chrome/Edge Web Browser: AGOL App shows "Cannot read properties of null (reading 'insertBefore')"

Question

Our department had this issue come up and we are unsure what is causing it. Viewing the app in all browsers seems to have no issues when using a computer/iPad/phone  out of our city network.

However, if using a city provided network computer it appears that the latest versions of Chrome and Edge cause the below URL to not work on desktop computers but will work when accessing the below URL on iPad or  any phone device. Of interesting note, viewing the below URL in Firefox works just fine for all in network devices.

In summary, has anybody seen this issue come up suddenly? What did you do to fix it?

The app was constructed from the Web App Builder templates and nothing has changed in the application for many months. Could this be an issue with a change in the setting of the network firewall?

https://mtjuliet.maps.arcgis.com/apps/webappviewer/index.html?id=f26b4124ec4a41c7bdbfac09255c55d8

AGOL URL Screen.JPG

clt_cabq_0-1726157496433.png

BrandonOConnor · Answer

Thanks for posting this error; I received several reports of this at my workplace, and bypassing Dashlane (per the comments) has resolved the issue. That said, we have reached out to Dashlane and they are now aware of the issue, and will be releasing a hotfix for this on March 20, 2023.

MichaelSlee · Answer

We started to experience this issue last week. As of now I've had four users report this issue. I checked and so far it looks like they all have Dashlane enabled and using that extension for their password management. Toggling this extension off resolved the issue. 
@ESRI1 I'm wondering why this suddenly seems to be an issue as of last week? This happens for the affected users for AGS Portal and AGOL content.

BeninAlbert · Answer

Removing dashlane from my browser extensions solved this error. Thank you!