4 files changed, 25 insertions, 8 deletions
diff --git a/app/scripts/lib/nodeify.js b/app/scripts/lib/nodeify.js
index 299bfe624..832d6c6d3 100644
--- a/app/scripts/lib/nodeify.js
+++ b/app/scripts/lib/nodeify.js
@@ -1,9 +1,10 @@
 const promiseToCallback = require('promise-to-callback')
 
-module.exports = function(fn, context) {
+module.exports = function nodeify (fn, context) {
   return function(){
     const args = [].slice.call(arguments)
     const callback = args.pop()
+    if (typeof callback !== 'function') throw new Error('callback is not a function')
     promiseToCallback(fn.apply(context, args))(callback)
   }
 }
diff --git a/test/unit/actions/tx_test.js b/test/unit/actions/tx_test.js
index 0ea1bfdc7..67c72e9a5 100644
--- a/test/unit/actions/tx_test.js
+++ b/test/unit/actions/tx_test.js
@@ -45,13 +45,15 @@ describe('tx confirmation screen', function () {
       before(function (done) {
         actions._setBackgroundConnection({
           approveTransaction (txId, cb) { cb('An error!') },
-          cancelTransaction (txId) { /* noop */ },
+          cancelTransaction (txId, cb) { cb() },
           clearSeedWordCache (cb) { cb() },
         })
 
-        const action = actions.cancelTx({value: firstTxId})
-        result = reducers(initialState, action)
-        done()
+        actions.cancelTx({value: firstTxId})((action) => {
+          result = reducers(initialState, action)
+          done()
+        })
+        
       })
 
       it('should transition to the account detail view', function () {
diff --git a/test/unit/nodeify-test.js b/test/unit/nodeify-test.js
index 06241334d..537dae605 100644
--- a/test/unit/nodeify-test.js
+++ b/test/unit/nodeify-test.js
@@ -17,4 +17,15 @@ describe('nodeify', function () {
       done()
     })
   })
+
+  it('should throw if the last argument is not a function', function (done) {
+    const nodified = nodeify(obj.promiseFunc, obj)
+    try {
+      nodified('baz')
+      done(new Error('should have thrown if the last argument is not a function'))
+    } catch (err) {
+      assert.equal(err.message, 'callback is not a function')
+      done()
+    }
+  })
 })
diff --git a/ui/app/actions.js b/ui/app/actions.js
index d99291e46..8ff8bbbdd 100644
--- a/ui/app/actions.js
+++ b/ui/app/actions.js
@@ -462,9 +462,12 @@ function cancelPersonalMsg (msgData) {
 }
 
 function cancelTx (txData) {
-  log.debug(`background.cancelTransaction`)
-  background.cancelTransaction(txData.id)
-  return actions.completedTx(txData.id)
+  return (dispatch) => {
+    log.debug(`background.cancelTransaction`)
+    background.cancelTransaction(txData.id, () => {
+      dispatch(actions.completedTx(txData.id))
+    })
+  }
 }
 
 //