From 688f8c9a01c2a58864360db7f8b559813d0c66b5 Mon Sep 17 00:00:00 2001
From: Vaporox <jan.zichler@gmx.de>
Date: Wed, 16 Dec 2020 16:09:41 +0100
Subject: [PATCH] fix(Collection): toJSON() errors if the collection includes
 empty values

---
 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 3219fb8a63d8..259244f15e19 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)));
   }
 }