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Running pretty much any asynchronous code will result in the error:


Uncaught (in promise) RuntimeError: function signature mismatch

Is my env setup wrong? I’ve gone through three brand new project setups and get this error every time. Has anyone else faced this issue?


For context: I have an async function at the root of my project plugin code, even running

await new Promise(resolve => setTimeout(resolve, 1000)); will result in the error.


As far as I can tell the code will keep running, as long as it doesn’t rely on the asynchronous piece.


The error will only happen on the return from the await-ed funciton.


Please advise.

Do you have figma.closePlugin() in the end of code? Maybe it runs before the async function finishes if it’s outside?

Just verified that close plugin is not called before the plugin exits, but that’s a good suggestion.


Do you know if it might be something else?

Are you loading any fonts by any chance? figma.loadFontAsync is known for throwing this error, although I don’t remember why.

@Nikita_Jerschow Did you solve this problem in the end?

I had the same issue and solved it with “await”.

I called “figma.loadFontAsync” in an async function, but I didn’t add the “await” statement when calling that function. So adding the “await” solved the problem for me.

Maybe just a problem with Figma runnig over a longer time?


Also think so. After restarting the desktop application, the error disappeared.

Thanks, it helped me too!

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