Only fetch category when it exists

src/Content/Item.php

@@ -93,6 +93,10 @@ class Item
 
 		$uid = $item['uid'] ?: $uid;
 
+		if (!Post\Category::existsForURIId($item['uri-id'], $uid)) {
+			return [$categories, $folders];
+		}
+
 		foreach (Post\Category::getArrayByURIId($item['uri-id'], $uid, Post\Category::CATEGORY) as $savedFolderName) {
 			if (!empty($item['author-link'])) {
 				$url = $item['author-link'] . "?category=" . rawurlencode($savedFolderName);

src/Model/Post/Category.php

@@ -111,6 +111,11 @@ class Category
 		return array_column($tags, 'name');
 	}
 
+	public static function existsForURIId(int $uri_id, int $uid)
+	{
+		return DBA::exists('post-category', ['uri-id' => $uri_id, 'uid' => $uid]);
+	}
+
 	/**
 	 * Generates an array of files or categories of a given uri-id
 	 *