[Meister2017]

functions_post_thanks.php

search:

            if (empty($postids))
            {
                $postids[] = $postid;
            }

replace with:

            if (empty($postids))
            {
    $postids = array();    
                $postids[] = $postid;      
            }

product-post_thanks-7.88.xml

<dependency dependencytype="vbulletin" minversion="4.2.0" maxversion="4.2.4" />

replace with:

<dependency dependencytype="vbulletin" minversion="4.2.0" maxversion="4.2.8" />