diff --git a/decode_stream.go b/decode_stream.go
index c5009a3..da75e8f 100644
--- a/decode_stream.go
+++ b/decode_stream.go
@@ -82,7 +82,14 @@ func (s *stream) readBuf() []byte {
 		copy(s.buf, remainBuf)
 	}
 	remainLen := s.length - s.cursor
-	return s.buf[s.cursor+remainLen:]
+	remainNotNulCharNum := int64(0)
+	for i := int64(0); i < remainLen; i++ {
+		if s.buf[s.cursor+i] == nul {
+			break
+		}
+		remainNotNulCharNum++
+	}
+	return s.buf[s.cursor+remainNotNulCharNum:]
 }
 
 func (s *stream) read() bool {
diff --git a/decode_string.go b/decode_string.go
index fc9aae2..8f1b0e5 100644
--- a/decode_string.go
+++ b/decode_string.go
@@ -213,6 +213,7 @@ func stringBytes(s *stream) ([]byte, error) {
 			s.buf = append(append(append([]byte{}, s.buf[:cursor]...), runeErrBytes...), s.buf[cursor+1:]...)
 			_, _, p = s.stat()
 			cursor += runeErrBytesLen
+			s.length += runeErrBytesLen
 			continue
 		case nul:
 			s.cursor = cursor
@@ -238,6 +239,7 @@ func stringBytes(s *stream) ([]byte, error) {
 				_, _, p = s.stat()
 			}
 			cursor += int64(len(b))
+			s.length += int64(len(b))
 			continue
 		}
 		cursor++