We've just started getting the same error this morning. We weren't doing anything too dramatic at the time - added a sprint, edited a workflow or two so not really sure what caused it.
I did notice the Git Integration add-on throwing some console errors because our evaluation licence has expired, so I've disabled it for now. Haven't gotten the error since, but it isn't consistent so can't be sure.
I've also disabled the 'Email This Issue' add-on as again it it has expired, but no idea if that helped.
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