return empty slice if state is nil (#4365)

prysmaticlabs · Dec 29, 2019 · 2b7acdf · 2b7acdf
1 parent 7f450e5
commit 2b7acdf
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/beacon-chain/blockchain/chain_info.go b/beacon-chain/blockchain/chain_info.go
@@ -150,6 +150,10 @@ func (s *Service) HeadValidatorsIndices(epoch uint64) ([]uint64, error) {
 
 // HeadSeed returns the seed from the head view of a given epoch.
 func (s *Service) HeadSeed(epoch uint64) ([32]byte, error) {
+	if s.headState == nil {
+		return [32]byte{}, nil
+	}
+
 	return helpers.Seed(s.headState, epoch, params.BeaconConfig().DomainBeaconAttester)
 }