diff --git a/src/controllers/tags.js b/src/controllers/tags.js
index 52ef647625..4b8385b177 100644
--- a/src/controllers/tags.js
+++ b/src/controllers/tags.js
@@ -91,7 +91,8 @@ tagsController.getTag = async function (req, res) {
 };
 
 tagsController.getTags = async function (req, res) {
-	const cids = await categories.getCidsByPrivilege('categories:cid', req.uid, 'topics:read');
+	let cids = await categories.getCidsByPrivilege('categories:cid', req.uid, 'topics:read');
+	cids = cids.filter(cid => cid !== -1);
 	const [canSearch, tags] = await Promise.all([
 		privileges.global.can('search:tags', req.uid),
 		topics.getCategoryTagsData(cids, 0, 99),