diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index ffb0ddc0..4fd5c496 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -560,7 +560,7 @@ script.execute = function execute(s, stack, tx, index, recurse) {
             n = new bn(0);
             switch (o) {
               case 'add':
-                n = n1.add(b2);
+                n = n1.add(n2);
                 break;
               case 'sub':
                 n = n1.sub(n2);
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 2bc8a4bd..b304506a 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -852,10 +852,10 @@ TX.prototype.getConfirmations = function getConfirmations(chain) {
   if (!chain)
     return 0;
 
-  top = chain.index.heights[chain.index.heights.length - 1];
+  top = chain.getHeight(chain.index.hashes[chain.index.hashes.length - 1]);
   height = this.getHeight(chain);
 
-  if (height === -1)
+  if (top === -1 || height === -1)
     return 0;
 
   return top - height + 1;