json_decode() expects parameter 1 to be string

My Hikashop orders don't work well anymore.
During the checkout-proces you get the error: Call to undefined function yjsg_shortcodes()

After putting the logging on in the site, as soon as you arrive on the shop-page there is on top of the page the error (4 times):
Warning: json_decode() expects parameter 1 to be string, array given in /home/deb99152/domains/markiesjesvereniging.nl/public_html/plugins/system/yjsg/includes/yjsgcore/classes/extend/38/module/helper.php on line 181(
(also the submenu-items are very high, but I can change that with css I think).

Does anyone know how to fix this (I would be very gratefull).

Are you sure your are posting in product assigned forum?: Yes

What is your CMS version?: Joomla 3.x

MySQL Version: 5.x

PHP version: 4.x

Link to installation: https://www.markiesjesvereniging.nl/shop.html

Have you edited any files? If yes tell us which ones.: N/A

Is this personal or client website?: Client

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