diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index d562ef34..081e934d 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -13,10 +13,10 @@ function Block(data) {
   this.bits = data.bits;
   this.nonce = data.nonce;
   this.totalTX = data.totalTX;
-  this.hashes = data.hashes.map(function(hash) {
+  this.hashes = (data.hashes || []).map(function(hash) {
     return utils.toHex(hash);
   });
-  this.flags = data.flags;
+  this.flags = data.flags || [];
 
   // List of matched TXs
   this.tx = [];