Add null pointer test to String destructor

1 files changed, 1 insertions, 1 deletions

diff --git a/cores/arduino/WString.cpp b/cores/arduino/WString.cpp
index f2572d6..043fda7 100644
--- a/cores/arduino/WString.cpp
+++ b/cores/arduino/WString.cpp
@@ -121,7 +121,7 @@ String::String(double value, unsigned char decimalPlaces)
 
 String::~String()
 {
-	free(buffer);
+	if (buffer) free(buffer);
 }
 
 /*********************************************/