diff --git a/src/class-plugin-curated-posts.php b/src/class-plugin-curated-posts.php
index f9a05d3..fae0b9d 100644
--- a/src/class-plugin-curated-posts.php
+++ b/src/class-plugin-curated-posts.php
@@ -77,7 +77,7 @@ public function with_query_context( array $context, array $attributes, WP_Block_
 		$pinned_posts = array_map( fn ( $id ) => $id && 'publish' === get_post_status( $id ) ? $id : null, $pinned_posts );
 
 		$queries = new Positioned_Post_Queries(
-			positioned: $pinned_posts,
+			positioned: is_array( $pinned_posts ) ? $pinned_posts : [],
 			default_per_page: $args['posts_per_page'],
 			origin: $this->queries,
 		);