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Hello,
Sorry for the inconvenience.
We’ve just released 6.4.3 and Pro 3.2.4 which need to be both updated. It looks like you have Pro 3.2.3 which has that specific line of code which would only be compatible with 6.4.2.
We’ve written an explanation on our blog as to why this is happening.
In your case, you’re just seeing a warning, which is something I recommend you disable anyway, this is more serious for those running PHP 8.1 along without the latest versions of EM and Pro together.