Error 500 with Toolza Mega–Tools and Machine Super Store v3

[Prestadude1]

Hello Prestashop Forum

I work with Prestashop 1.7.7.4

I bought and installed the template Toolza Mega–Tools and Machine Super Store v3 by Themevolty and my shop stopped working.
The website displays the following:

[PrestaShopException]

Invalid category vars
at line 388 in file classes/Link.php

383.             if (is_array($category) && isset($category['id_category'])) {
384.                 $category = new Category($category, $idLang);
385.             } elseif ((int) $category) {
386.                 $category = new Category((int) $category, $idLang);
387.             } else {
388.                 throw new PrestaShopException('Invalid category vars');
389.             }
390.         }
391. 
392.         return $category;
393.     }

I contacted the Template support, but that seemed to be a scam... maybe I'm getting something wrong, but I won't give access to my computer via ultraviewer, aswell as giving away my login to prestashop and my server.

The Prestashop Support has quite a long response time and it is, as you probably know, quite expensive. I'd really prefer not to spend 100 bucks on support for something that might be a minor error.

 

Is there anyone out there, who can help me with this problem? Maybe it is simpler than I think... at least I hope so

Cheers