How to fix ​"MutationEvent is not defined"

Issue

The browser, Chrome or Edge, gives a pop-up error "MutationEvent is not defined" when viewing a certain page on your machine's web server.

Product Line

Power Monitoring Expert 9.x

Power Monitoring Expert 2020

Power Monitoring Expert 2021

Power Monitoring Expert 2022

Power Monitoring Expert 2023

Environment

Edge

Chrome

Firefox

Example

You get this error message when you connect to a PME via the web interface from the network,

but if you connect to the web from the application server you don't get it

Resolution:

A quick fix

1. Use a different browser, like chrome or Firefox.
2. In Chrome, go to chrome://flags/ search for "mutation", and set Enable (deprecated) synchronous mutation events to Enabled.
3. 
4. In Edge, go to edge://flag search for "mutation", and set Enable (deprecated) synchronous mutation events to Enabled.
5. 

Note

Google Chrome and Microsoft Edge have been updated to no longer support synchronous mutation events, used by various manufacturers in their web servers.

Publicerad för:Schneider Electric Sverige