What are the exact steps need to replicate the issue? Sending email does not use CkEditor anywhere in the system. CKEditor is only used by users creating content on the front-end. There should be no Javascript or JSON when sending email as that happens behind the scenes. We do not use Javascript in server side processing.
Also what is the JSON string that is causing the error? This should be viewable in the Network Tab of your browser's developer tools (javascript is only used in the browser) as well as the Console tab where the error is logged.
Also what is the JSON string that is causing the error? This should be viewable in the Network Tab of your browser's developer tools (javascript is only used in the browser) as well as the Console tab where the error is logged.
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