Unable to launch roblox from the website (null GameLauncherInterface)

[BusyCityGuy]

Every time I click the green Play button on the Roblox website in my browser, I expect the Roblox application to launch and join the game, however nothing happens.

If I check the F12 console in my browser, each click produces this error:

text

Uncaught (in promise) TypeError: R.gameLaunchInterface is null
V gameLauncher.js:86
launchGame playGameService.js:33
ze playButtonUtils.ts:84
onClick PlayButton.tsx:346
t d37111614f2193fb5edd8c7c8cc7af37fdc4cf4e7e8c3f0e4894d51512658a7f.js:1
t d37111614f2193fb5edd8c7c8cc7af37fdc4cf4e7e8c3f0e4894d51512658a7f.js:1
rt d37111614f2193fb5edd8c7c8cc7af37fdc4cf4e7e8c3f0e4894d51512658a7f.js:1
rt d37111614f2193fb5edd8c7c8cc7af37fdc4cf4e7e8c3f0e4894d51512658a7f.js:1
onClick PlayButton.tsx:305
React 15
t edc66704bd1974195d8c60f4a163441bec82f1bcb11c492e7df07c43f45a4d49.js:16
gameLauncher.js:86:6

If we have a look at the line of code that’s erroring:

This errors when gameLauncherInterface is null.

if (gameLauncher.gameLaunchInterface.isJoinAttemptIdEnabled) {

Notably there is already a function defined earlier in the file that seems like it should be used here instead, because it has a null check:

function isJoinAttemptIdEnabled() {
  return gameLauncher.gameLaunchInterface?.isJoinAttemptIdEnabled;
}

As a workaround, I am able to open the Roblox app manually through the windows start menu, just launching from my browser doesn’t work. I first noticed this happening a month or two ago.

Browser I’m using:
Firefox 125.0.2 (64-bit)
on Windows 23H2

[Iron_Legion]

Thanks for the detailed report. Does this only happen on Firefox?

Do you have any browser plugins installed that might be interfering with the page? If so, can you try disabling them temporarily to see if that helps?

[BusyCityGuy]

I tried on two other browsers, logged into two different roblox accounts:

• Microsoft Edge: It worked just fine
• Firefox Developer: It worked just fine (this has all the same extensions installed as my regular Firefox)

Here are steps I tried to resolve the issue, but none of them worked:

• Disabled all my extensions (Bitwarden, AdBlock, and Roblox DevHub Search)
• Logging out and logging into the same account
• Logging out and logging into a different account
• Used “Switch Accounts” feature in the browser to try from another account
• Restarted the browser
• Restarted computer
• Reinstalled Roblox Player

I sent you the whole console log export in DM in case there are other relevant errors.

[BusyCityGuy]

Update: I was able to resolve the issue by clearing cookies and site data. So, somehow my cookies/site data got into a bad state and logging out/in didn’t fix it by itself.

I’m not sure what exactly was wrong, but after clearing & re-logging in, it worked normally as expected.