From bc8062cd3c15c1eb73eb9fe474d809ab893da063 Mon Sep 17 00:00:00 2001
From: "Ilya.Zhernosek" <zhernosekim@yahoo.com>
Date: Thu, 30 May 2019 15:52:54 +0300
Subject: [PATCH] fix error "accessing the caller property of a function" on
 IE11

---
 src/handlers.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/handlers.js b/src/handlers.js
index 74fa71d..d5b4743 100644
--- a/src/handlers.js
+++ b/src/handlers.js
@@ -9,7 +9,13 @@ import {
 const hasOwnProperty = Object.prototype.hasOwnProperty
 const wellKnownSymbols = new Set(
   Object.getOwnPropertyNames(Symbol)
-    .map(key => Symbol[key])
+    .map(key => {
+      try {
+        return Symbol[key]
+      } catch (e) {
+        return null;
+      }
+    })
     .filter(value => typeof value === 'symbol')
 )