Invalid Block

```
WARN[3350] Failed to handle SyncMessage[0x15]. Err: onBlocksResponse check failed from peer: 12D3KooWCsrjMDRDzaui6CLdSgEVB9c7SCr5gmJszzsEpa933pTD, SyncBlocks: &{Idx:0 Blocks:[0xc0009b8dc0 0xc0009b8e60 0xc0009b8f00 0xc0009b8fa0]}  source="blocksync/sync_server.go:62" tag=blocksync
```