diff --git a/src/categories/topics.js b/src/categories/topics.js
index 64248890c0..86b41141f7 100644
--- a/src/categories/topics.js
+++ b/src/categories/topics.js
@@ -15,6 +15,7 @@ module.exports = function (Categories) {
 		let results = await plugins.hooks.fire('filter:category.topics.prepare', data);
 		const tids = await Categories.getTopicIds(results);
 		let topicsData = await topics.getTopicsByTids(tids, data.uid);
+		console.log(topicsData);
 		topicsData = await user.blocks.filter(data.uid, topicsData);
 
 		if (!topicsData.length) {
diff --git a/src/topics/index.js b/src/topics/index.js
index 1c9d8fcbc4..ae3b345768 100644
--- a/src/topics/index.js
+++ b/src/topics/index.js
@@ -10,6 +10,7 @@ const plugins = require('../plugins');
 const meta = require('../meta');
 const user = require('../user');
 const categories = require('../categories');
+const activitypub = require('../activitypub');
 const privileges = require('../privileges');
 const social = require('../social');
 
@@ -71,10 +72,10 @@ Topics.getTopicsByTids = async function (tids, options) {
 		const topics = await Topics.getTopicsData(tids);
 		const uids = _.uniq(topics
 			.map(t => t && t.uid && t.uid.toString())
-			.filter(v => utils.isNumber(v) || validator.isUUID(String(v))));
+			.filter(v => utils.isNumber(v) || activitypub.helpers.isUri(v)));
 		const cids = _.uniq(topics
 			.map(t => t && t.cid && t.cid.toString())
-			.filter(v => utils.isNumber(v) || validator.isUUID(String(v))));
+			.filter(v => utils.isNumber(v)));
 		const guestTopics = topics.filter(t => t && t.uid === 0);
 
 		async function loadGuestHandles() {