diff --git a/concrete/blocks/topic_list/controller.php b/concrete/blocks/topic_list/controller.php
index b808ca0dec7..66a58f8f9cc 100644
--- a/concrete/blocks/topic_list/controller.php
+++ b/concrete/blocks/topic_list/controller.php
@@ -246,7 +246,7 @@ public function getImportData($blockNode, $page)
         $treeName = (string) $blockNode->data->tree;
         $page = (string) $blockNode->data->cParentID;
         $tree = TopicTree::getByName($treeName);
-        $args['topicTreeID'] = $tree?->getTreeID() ?: null;
+        $args['topicTreeID'] = empty($tree) ? null : $tree->getTreeID();
         $args['cParentID'] = 0;
         $args['title'] = (string) $blockNode->data->title;
         $args['mode'] = (string) $blockNode->data->mode;