"Cannot read property 'body' of null" error (TinyMCE)

If you're using TinyMCE or TinyMCE RTE with ContentBlocks and encounter an infinite save loop, it's possible to receive a JavaScript TypeError with the message: "Cannot read property body of null"

To avoid that error, disable the contentblocks.remove_content_dom system setting.

This problem occurs when a rich text editor is initialized on the content field of a resource, while ContentBlocks is set to remove that field from the page. Removing the field from the page is necessary to avoid another issue when using Redactor.