diff --git a/cgo/ffmpeg/audio.go b/cgo/ffmpeg/audio.go
index fef83c6..296431a 100644
--- a/cgo/ffmpeg/audio.go
+++ b/cgo/ffmpeg/audio.go
@@ -585,8 +585,8 @@ func (self *AudioDecoder) Decode(pkt []byte) (gotframe bool, frame av.AudioFrame
 
 	cgotframe := C.int(0)
 
-	if ff.codecCtx == nil {
-		err = fmt.Errorf("ffmpeg: Decode ff.codecCtx NULL")
+	if ff.codecCtx == nil || &pkt[0] == nil {
+		err = fmt.Errorf("ffmpeg: Decode ff.codecCtx NULL or pkg NULL")
 		return 
 	}