Crashes Network Admin

We are using TF Numbers with the Counter Animation addon and it works great. The only problem is that it crashes the Network Admin on Multisite. That is, when TF Numbers is active, our Network Admin is completely inaccessible. Renaming the tf-numbers-controls folder brings it back up.

Portion of error:
PHP Fatal error: Uncaught Error: Call to undefined function wp_get_current_user()
/wp-content/plugins/tf-numbers-controls/tf-numbers-controls.php(20): require_once(‘/nas/content/li…’)

Not super urgent, but somewhat annoying. Any help is appreciated.