TinyMCE issues since updating to 2.4.5

Hi,

Since updating to 2.4.5, the HTML formatting buttons in the Text view of the post editor aren’t showing. With AIOSEO disabled, the buttons return.

The following error appears on the Chrome console:

aioseop_module.js?ver=2.4.5:719 Uncaught TypeError: Cannot read property 'toLowerCase' of undefined
    at initAll (aioseop_module.js?ver=2.4.5:719)
    at HTMLDocument.<anonymous> (aioseop_module.js?ver=2.4.5:715)
    at i (load-scripts.php:2)
    at Object.fireWith [as resolveWith] (load-scripts.php:2)
    at Function.ready (load-scripts.php:2)
    at HTMLDocument.K (load-scripts.php:2)