Problog: call to missing function in RelatedPages

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I know this is a question that should be directed to the developer (which is has been), but rather than wait for one developer to take forever to respond I thought I would ask the community as well considering this is a popular, and pretty awesome (when it works properly) add-on, and there may be other who are having/had the same issues.

With 5.7.5.6 and ProBlog 2.6.3 I now get
Fatal error: Call to undefined method Concrete\Package\Problog\Block\RelatedPages\Controller::getAttributeKeyID()
/web/packages/problog/blocks/related_pages/controller.php
                if ($this->displayFeaturedOnly == 1) {
                    $cak = CollectionAttributeKey::getByHandle('is_featured');
                    if (is_object($cak)) {
                        $pl->filterByIsFeatured(1);
                    }
                }
                if ($this->getAttributeKeyID()) {  <- BREAKS HERE
                    if ($this->akID == 'same_tags') {
                        if (!is_object($c)) {


I can see that getAttributeKeyID() is defined in Concrete\Core\Attribute\Key, and that Concrete\Package\Problog\Block\RelatedPages\Controller 'uses' \Concrete\Core\Attribute\Key\CollectionKey as CollectionAttributeKey, which I assumed, somewhere, somehow, has access to the Key Class, but clearly I am wrong.

Any thoughts as to where the problem lies?

ntisithoj