From a6b51ed8fb5cea1f8f7c0032d47ccdd5516c430a 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 f7edbfbc7456..9dae836d9770 100644
--- a/src/renderers/shared/ReactDebugTool.js
+++ b/src/renderers/shared/ReactDebugTool.js
@@ -291,7 +291,9 @@ function markEnd(debugID, markType) {
   }
 
   performance.clearMarks(markName);
-  performance.clearMeasures(measurementName);
+  if (measurementName) {
+    performance.clearMeasures(measurementName);
+  }
 }
 
 var ReactDebugTool = {