From db1152fed93079955755735067741379a939e566 Mon Sep 17 00:00:00 2001
From: Sky Young <skyoung@mediciventures.com>
Date: Tue, 23 Jul 2019 12:20:48 -0600
Subject: [PATCH] Verify merkle root exists before matching on it

---
 lib/blocks.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/lib/blocks.js b/lib/blocks.js
index be04d1d..e9f82c6 100644
--- a/lib/blocks.js
+++ b/lib/blocks.js
@@ -155,14 +155,16 @@ BlockController.prototype.transformBlock = function(block, info) {
   // MerkleRoot is backwards hex data in the block object, flip before returning
   var merkleRoot = block.merkleRoot;
 
-  var strArray = merkleRoot.match(/.{1,2}/g);
-  var reversedArray = strArray.reverse();
-  var builtStr = "";
-  for (var str of reversedArray){
-    builtStr += str;
-  }
+  if (merkleRoot) {
+    var strArray = merkleRoot.match(/.{1,2}/g);
+    var reversedArray = strArray.reverse();
+    var builtStr = "";
+    for (var str of reversedArray){
+      builtStr += str;
+    }
 
-  merkleRoot = builtStr
+    merkleRoot = builtStr
+  }
 
   return {
     hash: block.rhash(),