diff --git a/src/scripts.js b/src/scripts.js
index e58ce99..52824cd 100644
--- a/src/scripts.js
+++ b/src/scripts.js
@@ -65,8 +65,8 @@ function isPubKeyOutput(script) {
 
 function isScriptHashInput(script, allowIncomplete) {
   if (script.chunks.length < 2) return false
-  var lastChunk = script.chunks[script.chunks.length - 1]
 
+  var lastChunk = script.chunks[script.chunks.length - 1]
   if (!Buffer.isBuffer(lastChunk)) return false
 
   var scriptSig = Script.fromChunks(script.chunks.slice(0, -1))
diff --git a/test/transaction_builder.js b/test/transaction_builder.js
index 83ee604..cf14df6 100644
--- a/test/transaction_builder.js
+++ b/test/transaction_builder.js
@@ -164,7 +164,7 @@ describe('TransactionBuilder', function() {
     })
 
     fixtures.invalid.build.forEach(function(f) {
-      describe('for ' + f.description, function() {
+      describe('for ' + (f.description || f.exception), function() {
         beforeEach(function() {
           if (f.txHex) {
             var tx = Transaction.fromHex(f.txHex)
@@ -175,7 +175,7 @@ describe('TransactionBuilder', function() {
           }
         })
 
-        it('throws on ' + f.exception, function() {
+        it('throws', function() {
           assert.throws(function() {
             txb.build()
           }, new RegExp(f.exception))