diff --git a/src/socket.io/posts/votes.js b/src/socket.io/posts/votes.js
index a7426e49ba..3a92360535 100644
--- a/src/socket.io/posts/votes.js
+++ b/src/socket.io/posts/votes.js
@@ -5,11 +5,17 @@ const sockets = require('../index');
 
 module.exports = function (SocketPosts) {
 	SocketPosts.getVoters = async function (socket, data) {
+		if (!data || !data.pid) {
+			throw new Error('[[error:invalid-data]]');
+		}
 		sockets.warnDeprecated(socket, 'GET /api/v3/posts/:pid/voters');
 		return await api.posts.getVoters(socket, { pid: data.pid });
 	};
 
 	SocketPosts.getUpvoters = async function (socket, pids) {
+		if (!Array.isArray(pids)) {
+			throw new Error('[[error:invalid-data]]');
+		}
 		sockets.warnDeprecated(socket, 'GET /api/v3/posts/:pid/upvoters');
 		return await api.posts.getUpvoters(socket, { pid: pids[0] });
 	};