From 74244999f589e91efb9f6c71bec8df0e4721decb Mon Sep 17 00:00:00 2001
From: jbo023 <jbolling@virtualcitysystems.de>
Date: Fri, 17 Apr 2020 12:45:39 +0200
Subject: [PATCH] add nullpointer check

---
 Source/Scene/BillboardCollection.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Source/Scene/BillboardCollection.js b/Source/Scene/BillboardCollection.js
index 9009cc2b48d8..6d146dfa157d 100644
--- a/Source/Scene/BillboardCollection.js
+++ b/Source/Scene/BillboardCollection.js
@@ -322,7 +322,9 @@ function BillboardCollection(options) {
         var billboards = this._billboards;
         var length = billboards.length;
         for (var i = 0; i < length; ++i) {
-          billboards[i]._updateClamping();
+          if (billboards[i]) {
+            billboards[i]._updateClamping();
+          }
         }
       },
       this