diff --git a/encode.go b/encode.go
index d258c45..0874e84 100644
--- a/encode.go
+++ b/encode.go
@@ -112,7 +112,7 @@ func (e *Encoder) EncodeWithOption(v interface{}, opts ...EncodeOption) error {
 		}
 	}
 	header := (*interfaceHeader)(unsafe.Pointer(&v))
-	buf, err := e.encode(header)
+	buf, err := e.encode(header, v == nil)
 	if err != nil {
 		return err
 	}
@@ -160,8 +160,8 @@ func (e *Encoder) reset() {
 	e.unorderedMap = false
 }
 
-func (e *Encoder) encodeForMarshal(header *interfaceHeader) ([]byte, error) {
-	buf, err := e.encode(header)
+func (e *Encoder) encodeForMarshal(header *interfaceHeader, isNil bool) ([]byte, error) {
+	buf, err := e.encode(header, isNil)
 	if err != nil {
 		return nil, err
 	}
@@ -178,9 +178,9 @@ func (e *Encoder) encodeForMarshal(header *interfaceHeader) ([]byte, error) {
 	return copied, nil
 }
 
-func (e *Encoder) encode(header *interfaceHeader) ([]byte, error) {
+func (e *Encoder) encode(header *interfaceHeader, isNil bool) ([]byte, error) {
 	b := e.buf[:0]
-	if header.ptr == nil {
+	if isNil {
 		b = encodeNull(b)
 		if e.enabledIndent {
 			b = encodeIndentComma(b)
diff --git a/json.go b/json.go
index 28c6094..4f02347 100644
--- a/json.go
+++ b/json.go
@@ -163,7 +163,7 @@ func MarshalNoEscape(v interface{}) ([]byte, error) {
 	var b *bytes.Buffer
 	enc := NewEncoder(b)
 	header := (*interfaceHeader)(unsafe.Pointer(&v))
-	bytes, err := enc.encodeForMarshal(header)
+	bytes, err := enc.encodeForMarshal(header, v == nil)
 	if err != nil {
 		enc.release()
 		return nil, err
@@ -183,7 +183,7 @@ func MarshalWithOption(v interface{}, opts ...EncodeOption) ([]byte, error) {
 	}
 	header := (*interfaceHeader)(unsafe.Pointer(&v))
 	enc.ptr = header.ptr
-	bytes, err := enc.encodeForMarshal(header)
+	bytes, err := enc.encodeForMarshal(header, v == nil)
 	if err != nil {
 		enc.release()
 		return nil, err
@@ -211,7 +211,7 @@ func MarshalIndentWithOption(v interface{}, prefix, indent string, opts ...Encod
 	enc.SetIndent(prefix, indent)
 	header := (*interfaceHeader)(unsafe.Pointer(&v))
 	enc.ptr = header.ptr
-	bytes, err := enc.encodeForMarshal(header)
+	bytes, err := enc.encodeForMarshal(header, v == nil)
 	if err != nil {
 		enc.release()
 		return nil, err
@@ -414,7 +414,7 @@ func HTMLEscape(dst *bytes.Buffer, src []byte) {
 	enc.SetEscapeHTML(true)
 	header := (*interfaceHeader)(unsafe.Pointer(&v))
 	enc.ptr = header.ptr
-	enc.buf, _ = enc.encode(header)
+	enc.buf, _ = enc.encode(header, v == nil)
 	dst.Write(enc.buf[:len(enc.buf)-1]) // remove last ',' character
 }