How to Fix PHP Fatal error Uncaught Error: Call to undefined method Sensei_Blocks::has_sensei_blocks()

I started getting this error after pushing a staging site to live from Scriptaculous:

PHP Fatal error Uncaught Error: Call to undefined method Sensei_Blocks::has_sensei_blocks() in /.../wp-content/plugins/woothemes-sensei/plugins/sensei-lms/includes/sensei-functions.php:38

Stack trace:

#0 /.../wp-content/plugins/woothemes-sensei/plugins/sensei-lms/includes/class-sensei.php(1269): is_sensei()
#1 /.../wp-includes/class-wp-hook.php(305): Sensei_Main-body_class(Array)
#2 /.../wp-includes/plugin.php(189): WP_Hook-apply_filters(Array, Array)