From 0711d94ba27031045691c06cf97228fe62e6785b Mon Sep 17 00:00:00 2001
From: Xiaoji Chen <Pessimistress@users.noreply.github.com>
Date: Wed, 4 Nov 2020 11:55:32 -0800
Subject: [PATCH] Safety check before calling cloneElement (#1219)

---
 src/components/source.js | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/components/source.js b/src/components/source.js
index 022960a25..e7e7424ea 100644
--- a/src/components/source.js
+++ b/src/components/source.js
@@ -149,10 +149,13 @@ export default class Source<Props: SourceProps> extends PureComponent<Props> {
       this._map.on('styledata', this._updateSource);
     }
     this._updateSource();
-    return React.Children.map(this.props.children, child =>
-      cloneElement(child, {
-        source: this.id
-      })
+    return React.Children.map(
+      this.props.children,
+      child =>
+        child &&
+        cloneElement(child, {
+          source: this.id
+        })
     );
   }