From f6c4fe6cbbdca375b50ac10373007a9b74279e95 Mon Sep 17 00:00:00 2001
From: Chris Pearce <hello@chrispearce.me>
Date: Tue, 18 Apr 2017 14:31:47 +0100
Subject: [PATCH] Only attempt to clear measures if we created the measure
 (#9451)

This fixes an issue where if we decided not to create a measurement we would clear ALL measurements from the performance entry buffer due to passing `undefined` as the entry name.
---
 src/renderers/shared/ReactDebugTool.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/renderers/shared/ReactDebugTool.js b/src/renderers/shared/ReactDebugTool.js
index 7be3d38fe7..e735ad337a 100644
--- a/src/renderers/shared/ReactDebugTool.js
+++ b/src/renderers/shared/ReactDebugTool.js
@@ -305,7 +305,9 @@ if (__DEV__) {
     }
 
     performance.clearMarks(markName);
-    performance.clearMeasures(measurementName);
+    if (measurementName) {
+      performance.clearMeasures(measurementName);
+    }
   };
 
   ReactDebugTool = {