From b076b0ae89d74bf2c09df97c041f3588e020d0e9 Mon Sep 17 00:00:00 2001
From: Jeff Rowberg <jeff@rowberg.net>
Date: Mon, 29 Jul 2019 12:03:20 -0400
Subject: [PATCH] Add null pointer test to String destructor

---
 cores/arduino/WString.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/arduino/WString.cpp b/cores/arduino/WString.cpp
index 71bbc07d1..4c0155998 100644
--- a/cores/arduino/WString.cpp
+++ b/cores/arduino/WString.cpp
@@ -123,7 +123,7 @@ String::String(double value, unsigned char decimalPlaces)
 
 String::~String()
 {
-	free(buffer);
+	if (buffer) free(buffer);
 }
 
 /*********************************************/