diff --git a/beacon-chain/rpc/apimiddleware/structs.go b/beacon-chain/rpc/apimiddleware/structs.go
index e3d9ee2f7..80f37dba6 100644
--- a/beacon-chain/rpc/apimiddleware/structs.go
+++ b/beacon-chain/rpc/apimiddleware/structs.go
@@ -527,8 +527,8 @@ type beaconStateV2Json struct {
 	CurrentJustifiedCheckpoint  *checkpointJson        `json:"current_justified_checkpoint"`
 	FinalizedCheckpoint         *checkpointJson        `json:"finalized_checkpoint"`
 	InactivityScores            []string               `json:"inactivity_scores"`
-	CurrentSyncCommittee        syncCommitteeJson      `json:"current_sync_committee"`
-	NextSyncCommittee           syncCommitteeJson      `json:"next_sync_committee"`
+	CurrentSyncCommittee        *syncCommitteeJson     `json:"current_sync_committee"`
+	NextSyncCommittee           *syncCommitteeJson     `json:"next_sync_committee"`
 }
 
 type beaconStateContainerV2Json struct {
@@ -572,8 +572,8 @@ type committeeJson struct {
 }
 
 type syncCommitteeJson struct {
-	Pubkeys          []string `json:"pubkeys" hex:"true"`
-	PubkeyAggregates string   `json:"pubkey_aggregates" hex:"true"`
+	Pubkeys         []string `json:"pubkeys" hex:"true"`
+	AggregatePubkey string   `json:"aggregate_pubkey" hex:"true"`
 }
 
 type syncCommitteeValidatorsJson struct {
diff --git a/shared/gateway/api_middleware_processing.go b/shared/gateway/api_middleware_processing.go
index 3117f28eb..f05148b21 100644
--- a/shared/gateway/api_middleware_processing.go
+++ b/shared/gateway/api_middleware_processing.go
@@ -294,6 +294,9 @@ func hexToBase64Processor(v reflect.Value) error {
 }
 
 func base64ToHexProcessor(v reflect.Value) error {
+	if v.String() == "" {
+		return nil
+	}
 	b, err := base64.StdEncoding.DecodeString(v.String())
 	if err != nil {
 		return err