White blank page after update

This is the reason:
Fatal error: Call to undefined function is_composite_product() in /usr/www/…/wp-content/plugins/woo-add-gtin/includes/class-woo-gtin-functions.php on line 108

This may be a work-around for some. Works on my site.
https://gist.github.com/tankbar/452f0725ec59748e03f11592110d4e07

I use CodeSnippet plugin to add the code instead of messing with the functions.php

Sorry about that, this is fixed in version 0.3.1, please update.

Thanks!