Multpile errors in products.class.php

Hi,

WooCommerce Multilingual v3.5.4, WMPL v3.1.9.4 and WooCommerce v2.3.7.
The following errors occur with multiple languages and currencies set up.

Following errors occur when saving a variation product with multiple currencies.

PHP Warning: strtotime() expects parameter 1 to be string, array given in /woocommerce-multilingual/inc/products.class.php on line 1472

PHP Warning: strtotime() expects parameter 1 to be string, array given in /woocommerce-multilingual/inc/products.class.php on line 1473

Colour is the name of the attribute …

PHP Notice: Undefined index: colour in /woocommerce-multilingual/inc/products.class.php on line 1516

And this error is related to the currency dropdown in the WC Dashboard widget. It appears after a new user logs in for the first time.

PHP Warning: Cannot modify header information – headers already sent by (output started at /woocommerce-multilingual/inc/multi-currency.class.php:903) in /wp-includes/option.php on line 748

Another issue is when publishing a product, custom currency prices do not save with no visual errors. They only save on update.

https://wordpress.org/plugins/woocommerce-multilingual/