Twig\Error\RuntimeError

Line 80 of /var/www/wohnbau/site/templates/residential-talk.twig

Impossible to invoke a method ("focusCrop") on a null variable.

        {% block relatedContent %}
            {% for residentialTalk in page.siblings(false).shuffle().limit(3) %}
                <a class="related-link u-neutral-link" href="{{ residentialTalk.url }}" title="{{ residentialTalk.guest }}">
                    <article>
                        <h2 class="fontSmall">{{ residentialTalk.number }}</h2>
                        <div class="related-link__image">
                            {% set image = residentialTalk.content().image.toFile().focusCrop(580, 368) %}
                            <img alt="{{ image.alt }}" src="{{ image.url }}" alt width="580" height="368" />
                        </div>
                        <h3 class="fontMedium u-underline">{{ residentialTalk.guest }}</h3>
                        <h3 class="fontMedium u-underline">{{ residentialTalk.topic }}</h3>
                    </article>
                </a>