Add fix for infinite spinner for incorrect seed phrase.

app/scripts/metamask-controller.js

@@ -513,10 +513,15 @@ module.exports = class MetamaskController extends EventEmitter {
 
   async createNewVaultAndRestore (password, seed) {
     const release = await this.createVaultMutex.acquire()
+    try {
       const vault = await this.keyringController.createNewVaultAndRestore(password, seed)
       this.selectFirstIdentity(vault)
       release()
       return vault
+    } catch (err) {
+      release()
+      throw err
+    }
   }
 
   selectFirstIdentity (vault) {

ui/app/keychains/hd/restore-vault.js

@@ -149,4 +149,8 @@ RestoreVaultScreen.prototype.createNewVaultAndRestore = function () {
   this.warning = null
   this.props.dispatch(actions.displayWarning(this.warning))
   this.props.dispatch(actions.createNewVaultAndRestore(password, seed))
+  .catch((err) => {
+    log.error(err.message)
+  })
+
 }