refatcor(feaderation): use P2WSHProgram for federation program on sidechain (#233)

[bytom/vapor.git] / protocol / block.go

diff --git a/protocol/block.go b/protocol/block.go
index a1d5830..0eafe27 100644 (file)
--- a/protocol/block.go
+++ b/protocol/block.go
@@ -205,7 +205,7 @@ func (c *Chain) reorganizeChain(blockHeader *types.BlockHeader) error {
                log.WithFields(log.Fields{"module": logModule, "height": blockHeader.Height, "hash": blockHash.String()}).Debug("attach from mainchain")
        }
 
-       if detachBlockHeaders[len(detachBlockHeaders)-1].Height <= c.bestIrrBlockHeader.Height && irrBlockHeader.Height <= c.bestIrrBlockHeader.Height {
+       if len(detachBlockHeaders) > 0 && detachBlockHeaders[len(detachBlockHeaders)-1].Height <= c.bestIrrBlockHeader.Height && irrBlockHeader.Height <= c.bestIrrBlockHeader.Height {
                return errors.New("rollback block below the height of irreversible block")
        }
        voteResults = append(voteResults, voteResult.Fork())