From d7e38fd2cdb0a0fa7882f3c39eca27aa78d37326 Mon Sep 17 00:00:00 2001
From: Hein Rutjes <hrutjes@gmail.com>
Date: Mon, 30 Mar 2020 12:28:32 +0200
Subject: [PATCH] [ios] Fix PerfMonitor crash on iOS 13.4

---
 React/Profiler/RCTPerfMonitor.m | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/React/Profiler/RCTPerfMonitor.m b/React/Profiler/RCTPerfMonitor.m
index 1db32322a33b78..7b943c8a0f2bd9 100644
--- a/React/Profiler/RCTPerfMonitor.m
+++ b/React/Profiler/RCTPerfMonitor.m
@@ -40,6 +40,14 @@ static BOOL RCTJSCSetOption(const char *option)
   static RCTJSCSetOptionType setOption;
   static dispatch_once_t onceToken;
 
+  // As of iOS 13.4, it is no longer possible to change the JavaScriptCore
+  // options at runtime. The options are protected and will cause an
+  // exception when you try to change them after the VM has been initialized.
+  // https://github.com/facebook/react-native/issues/28414
+  if (@available(iOS 13.4, *)) {
+    return NO;
+  }
+  
   dispatch_once(&onceToken, ^{
     /**
      * JSC private C++ static method to toggle options at runtime