add empty field check for cxreceiptproof

core/types/cx_receipt.go

@@ -179,3 +179,8 @@ func (cxp *CXReceiptsProof) GetToShardID() (uint32, error) {
 	}
 	return shardID, nil
 }
+
+// ContainsEmptyField checks whether the given CXReceiptsProof contains empty field
+func (cxp *CXReceiptsProof) ContainsEmptyField() bool {
+	return cxp == nil || cxp.Receipts == nil || cxp.MerkleProof == nil || cxp.Header == nil || len(cxp.CommitSig)+len(cxp.CommitBitmap) == 0
+}

node/node.go

@@ -295,6 +295,12 @@ func (node *Node) AddPendingTransaction(newTx *types.Transaction) {
 func (node *Node) AddPendingReceipts(receipts *types.CXReceiptsProof) {
 	node.pendingCXMutex.Lock()
 	defer node.pendingCXMutex.Unlock()
+
+	if receipts.ContainsEmptyField() {
+		utils.Logger().Info().Int("totalPendingReceipts", len(node.pendingCXReceipts)).Msg("CXReceiptsProof contains empty field")
+		return
+	}
+
 	blockNum := receipts.Header.Number().Uint64()
 	shardID := receipts.Header.ShardID()
 	key := utils.GetPendingCXKey(shardID, blockNum)