diff --git a/src/Document/GarbageCollection.php b/src/Document/GarbageCollection.php
index 120fd750..0a8244b7 100644
--- a/src/Document/GarbageCollection.php
+++ b/src/Document/GarbageCollection.php
@@ -17,7 +17,7 @@ class GarbageCollection {
 	/**
 	 * @param integer $number_of_posts  Number of post ids matching criteria.
 	 *
-	 * @return [int]  Array of post ids
+	 * @return int[]  Array of post ids
 	 */
 	public static function get_documents_by_age( $number_of_posts = 100 ) {
 		// $days_ago  Posts older than this many days ago
@@ -51,6 +51,11 @@ public static function get_documents_by_age( $number_of_posts = 100 ) {
 			]
 		);
 
+		/**
+		 * Because 'fields' returns 'ids', this returns array of post ints. Satisfy phpstan.
+		 *
+		 * @var int[]
+		 */
 		return $wp_query->get_posts();
 	}
 }
diff --git a/src/Document/Group.php b/src/Document/Group.php
index 7eb9d0e9..6bc3012b 100644
--- a/src/Document/Group.php
+++ b/src/Document/Group.php
@@ -14,6 +14,9 @@ class Group {
 
 	const TAXONOMY_NAME = 'graphql_document_group';
 
+	/**
+	* @return void
+	*/
 	public function init() {
 		register_taxonomy(
 			self::TAXONOMY_NAME,
@@ -41,10 +44,11 @@ public function init() {
 	/**
 	 * Look up the first group for a post
 	 *
-	 * @param int  The post id
+	 * @param int  $post_id The post id
+	 * @return string
 	 */
 	public static function get( $post_id ) {
 		$item = get_the_terms( $post_id, self::TAXONOMY_NAME );
-		return ! is_wp_error( $item ) && isset( $item[0]->name ) ? $item[0]->name : '';
+		return ! is_wp_error( $item ) && isset( $item[0] ) && property_exists( $item[0], 'name' ) ? $item[0]->name : '';
 	}
 }