From 942d924779671da45479c662b3b2e0f2112264b7 Mon Sep 17 00:00:00 2001
From: Julian Lam <julian@nodebb.org>
Date: Mon, 25 Jan 2021 11:19:16 -0500
Subject: [PATCH] fix: error on flag list if no flag filters were saved in
 session

---
 src/controllers/mods.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/controllers/mods.js b/src/controllers/mods.js
index 488621b0d8..eddb10b5d1 100644
--- a/src/controllers/mods.js
+++ b/src/controllers/mods.js
@@ -48,7 +48,9 @@ modsController.flags.list = async function (req, res, next) {
 	filters = filters.reduce(function (memo, cur) {
 		if (req.query.hasOwnProperty(cur)) {
 			if (req.query[cur] === '') {
-				delete req.session.flags_filters[cur];
+				if (req.session.hasOwnProperty('flags_filters')) {
+					delete req.session.flags_filters[cur];
+				}
 			} else {
 				memo[cur] = req.query[cur];
 			}