diff --git a/consensus/replay.go b/consensus/replay.go
index abc43eb5..c9a779e3 100644
--- a/consensus/replay.go
+++ b/consensus/replay.go
@@ -276,7 +276,12 @@ func (h *Handshaker) ReplayBlocks(
 
 	// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain.
 	if appBlockHeight == 0 {
-		nextVals := types.TM2PB.ValidatorUpdates(state.NextValidators) // state.Validators would work too.
+		validators := make([]*types.Validator, len(h.genDoc.Validators))
+		for i, val := range h.genDoc.Validators {
+			validators[i] = types.NewValidator(val.PubKey, val.Power)
+		}
+		validatorSet := types.NewValidatorSet(validators)
+		nextVals := types.TM2PB.ValidatorUpdates(validatorSet)
 		csParams := types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams)
 		req := abci.RequestInitChain{
 			Time:            h.genDoc.GenesisTime,
diff --git a/types/part_set.go b/types/part_set.go
index af59851c..a040258d 100644
--- a/types/part_set.go
+++ b/types/part_set.go
@@ -200,6 +200,9 @@ func (ps *PartSet) Total() int {
 }
 
 func (ps *PartSet) AddPart(part *Part) (bool, error) {
+	if ps == nil {
+		return false, nil
+	}
 	ps.mtx.Lock()
 	defer ps.mtx.Unlock()