Twig\Error\RuntimeError

Line 18 of /var/www/vhosts/muz.at/site/templates/blocks/block--multiple-link.html.twig

Impossible to access an attribute ("url") on a null variable.

                                {{ item.title }}
                            </div>
                            <div class="multiple-link-block__item-content font-m">
                                {{ item.text.kirbytext|raw }}
                            </div>
                            {% if item.document.isNotEmpty %}
                                <a href="{{ item.document.toFile.url }}" target="_blank"
                                   class="multiple-link-block__item-link button button--inverse">
                                    PDF
                                </a>
                            {% elseif item.link.isNotEmpty %}
                                {% set link = block.link.toLink() %}
                                <a href="{{ link }}"