diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index 17ae522533..e39f7d3e54 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -890,7 +890,8 @@ static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
     ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
     if (ret < 0)
         return ret;
-    memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
+    if (nut->header[header_idx])
+        memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
     pkt->pos = avio_tell(bc); // FIXME
     avio_read(bc, pkt->data + nut->header_len[header_idx], size);