diff --git a/raknet/BitStream.cpp b/raknet/BitStream.cpp
index 9961de0..9f4e22f 100644
--- a/raknet/BitStream.cpp
+++ b/raknet/BitStream.cpp
@@ -164,7 +164,7 @@ void BitStream::Reset( void )
 // Write an array or casted stream
 void BitStream::Write( const char* input, const int numberOfBytes )
 {
-	if (numberOfBytes==0)
+	if (numberOfBytes==0 || input==0)
 		return;
 
 	// Optimization: