diff --git a/IR_Encoder.cpp b/IR_Encoder.cpp
index cfded70..524270b 100644
--- a/IR_Encoder.cpp
+++ b/IR_Encoder.cpp
@@ -33,7 +33,7 @@ IR_Encoder::~IR_Encoder() {
     delete [] bitHigh;
 };
 
-void IR_Encoder::sendData(uint16_t addrTo, uint8_t* data, uint8_t len, bool needAccept = false) {
+void IR_Encoder::sendData(uint16_t addrTo, uint8_t* data = nullptr, uint8_t len = 0, bool needAccept = false) {
     if (len > bytePerPack) { return; }
     constexpr uint8_t dataStart = msgBytes + addrBytes + addrBytes;
     memset(sendBuffer, 0x00, dataByteSizeMax);
diff --git a/IR_Encoder.h b/IR_Encoder.h
index b87ddd2..f314d16 100644
--- a/IR_Encoder.h
+++ b/IR_Encoder.h
@@ -44,7 +44,7 @@ public:
 
     void IR_Encoder::setBlindDecoders(IR_DecoderRaw* decoders [], uint8_t count);
     void rawSend(uint8_t* ptr, uint8_t len);
-    void sendData(uint16_t addrTo, uint8_t* data, uint8_t len, bool needAccept = false);
+    void sendData(uint16_t addrTo, uint8_t* data = nullptr, uint8_t len = 0, bool needAccept = false);
     void sendAccept(uint16_t addrTo, uint8_t customByte = 0);
     void sendRequest(uint16_t addrTo);
     void sendBack(uint8_t* data = nullptr, uint8_t len = 0);