Error at publishing

[koalahbh]

Expected behaviour and actual behaviour

Save the post content

Steps to reproduce the problem

Edit some part of text making it bold

Specifications

• Browser Name and Version: Chrome Versão 56.0.2924.87 (64-bit)
• WordPress Version: 4.7.2
• Plugin Version: 2.2.1
• Theme name/URL: Flatsome https://themeforest.net/item/flatsome-multipurpose-responsive-woocommerce-theme/5484319

Error messages

Error at chrome console: wp-content-plugins-wp-front-end-editor-js-fee-2.2.1.js:23 PATCH http://blog.beard.com.br/wp-json/wp/v2/posts/7131 403 (Forbidden) send @ wp-includes-js-jquery-jquery-1.12.4.js:4 ajax @ wp-includes-js-jquery-jquery-1.12.4.js:4 e.ajax @ wp-includes-js-backbone.min-1.2.3.js:1 e.sync @ wp-includes-js-backbone.min-1.2.3.js:1 sync @ wp-content-plugins-wp-front-end-editor-js-fee-2.2.1.js:23 save @ wp-includes-js-backbone.min-1.2.3.js:1 save @ wp-content-plugins-wp-front-end-editor-js-fee-2.2.1.js:74 onclick @ wp-content-plugins-wp-front-end-editor-js-tinymce.theme-2.2.1.js:168 fire @ wp-content-plugins-wp-front-end-editor-vendor-tinymce-2.2.1.js:24944 fire @ wp-content-plugins-wp-front-end-editor-vendor-tinymce-2.2.1.js:27345 delegate @ wp-content-plugins-wp-front-end-editor-vendor-tinymce-2.2.1.js:27983 executeHandlers @ wp-content-plugins-wp-front-end-editor-vendor-tinymce-2.2.1.js:1168 defaultNativeHandler @ wp-content-plugins-wp-front-end-editor-vendor-tinymce-2.2.1.js:1195 VM93223:1 Uncaught SyntaxError: Unexpected token < in JSON at position 0 at JSON.parse () at Object. (wp-content-plugins-wp-front-end-editor-js-fee-2.2.1.js:31) at Object. (wp-includes-js-jquery-jquery-1.12.4.js:2) at i (wp-includes-js-jquery-jquery-1.12.4.js:2) at Object.fireWith [as rejectWith] (wp-includes-js-jquery-jquery-1.12.4.js:2) at y (wp-includes-js-jquery-jquery-1.12.4.js:4) at XMLHttpRequest.c (wp-includes-js-jquery-jquery-1.12.4.js:4)