diff --git a/eth/downloader/fetchers_concurrent_bodies.go b/eth/downloader/fetchers_concurrent_bodies.go
index 56359b33c9..3d8a1576a0 100644
--- a/eth/downloader/fetchers_concurrent_bodies.go
+++ b/eth/downloader/fetchers_concurrent_bodies.go
@@ -90,6 +90,9 @@ func (q *bodyQueue) request(peer *peerConnection, req *fetchRequest, resCh chan
 func (q *bodyQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
        txs, uncles, withdrawals := packet.Res.(*eth.BlockBodiesResponse).Unpack()
        hashsets := packet.Meta.([][]common.Hash) // {txs hashes, uncle hashes, withdrawal hashes}
+       if len(hashsets) != 3 {
+               panic("adsfadsf")
+       }