Error: Message manager disconnected

I bring up a window from my main page, perform a selectWindow, successfully interact with the window, select the “Ok” button which accepts the inputs on the window and closes the window. This all works fine; however, after the window closes, I immediately get
Error: Message manager disconnected and execution stops.

This is a big issue for me and my team using Katalon Recorder.


Please check out this link as other users have the same issue.

Let us know if you have other problem or concerns,

Thank you for choosing Katalon products,

I went to the link, which provided this guidance:

Start Firefox in Safe Mode to check if one of the extensions (“3-bar” menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: “3-bar” menu button or Tools -> Add-ons -> Appearance

  • Do NOT click the “Refresh Firefox” button on the Safe Mode start window

I ensured that no other Add-ons were installed ( I have FF 60 so no Add-ons section is even listed), I only have Katalon in my Extensions section, I made sure my Appearance setting was set to DEFAULT, and made sure hardware acceleration is not set. I even disabled the single Plugin listed.

I still get the error message above. Please note that the error message I get is not exactly the same as the one in the solution provided. It says "Promise rejected after context unloaded: Message manager disconnected. I get “Error: Message manager disconnected”.

Are there any other solutions to this issue? As I stated above, the suggested solution is for a different error message.

For Katalon Recorder to be useful to my team, we need the ability to bring up a window from the “main” window, interact with the new window, and close it via a submit action. Doing so now causes execution to stop with the message above: “Error: Message manager disconnected”