From 2c2249ee7314401b65be677c233370657e1d4695 Mon Sep 17 00:00:00 2001
From: Jan <66554238+Vaporox@users.noreply.github.com>
Date: Sat, 26 Dec 2020 10:56:37 +0100
Subject: [PATCH] fix(Collection): toJSON() errors if the collection includes
 empty values (#5129)

---
 src/util/Collection.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/Collection.js b/src/util/Collection.js
index 3219fb8a6..259244f15 100644
--- a/src/util/Collection.js
+++ b/src/util/Collection.js
@@ -5,7 +5,7 @@ const Util = require('./Util');
 
 class Collection extends BaseCollection {
   toJSON() {
-    return this.map(e => (typeof e.toJSON === 'function' ? e.toJSON() : Util.flatten(e)));
+    return this.map(e => (typeof e?.toJSON === 'function' ? e.toJSON() : Util.flatten(e)));
   }
 }