Hi. Can I please join in with this problem?

I think I have the same issue. Since today a warning pops up.

“Warning: Illegal string offset ‘thumbnail’ in /…/wp-content/plugins/dhvc-woocommerce/includes/class.php on line 1031
Warning: Illegal string offset ‘thumbnail’ in /…/wp-content/plugins/dhvc-woocommerce/includes/class.php on line 1030
Warning: Cannot assign an empty string to a string offset in /…/wp-content/plugins/dhvc-woocommerce/includes/class.php on line 1030”

What can I do?
Thanks in advance.