4 files changed, 33 insertions, 5 deletions
diff --git a/app/scripts/lib/cleanErrorStack.js b/app/scripts/lib/cleanErrorStack.js
new file mode 100644
index 000000000..fe1bfb0ce
--- /dev/null
+++ b/app/scripts/lib/cleanErrorStack.js
@@ -0,0 +1,24 @@
+/**
+ * Returns error without stack trace for better UI display
+ * @param {Error} err - error
+ * @returns {Error} Error with clean stack trace.
+ */
+function cleanErrorStack(err){
+  var name = err.name
+  name = (name === undefined) ? 'Error' : String(name)
+
+  var msg = err.message
+  msg = (msg === undefined) ? '' : String(msg)
+
+  if (name === '') {
+    err.stack = err.message
+  } else if (msg === '') {
+    err.stack = err.name
+  } else {
+    err.stack = err.name + ': ' + err.message
+  }
+
+  return err
+}
+
+module.exports = cleanErrorStack
diff --git a/app/scripts/lib/createErrorMiddleware.js b/app/scripts/lib/createErrorMiddleware.js
index baed99e45..c70beddfd 100644
--- a/app/scripts/lib/createErrorMiddleware.js
+++ b/app/scripts/lib/createErrorMiddleware.js
@@ -59,6 +59,7 @@ function createErrorMiddleware ({ override = true } = {}) {
       if (!error) { return done() }
       sanitizeRPCError(error)
       log.error(`MetaMask - RPC Error: ${error.message}`, error)
+      done()
     })
   }
 }
diff --git a/app/scripts/lib/get-first-preferred-lang-code.js b/app/scripts/lib/get-first-preferred-lang-code.js
index 5473fccf0..1e6a83ba6 100644
--- a/app/scripts/lib/get-first-preferred-lang-code.js
+++ b/app/scripts/lib/get-first-preferred-lang-code.js
@@ -2,6 +2,12 @@ const extension = require('extensionizer')
 const promisify = require('pify')
 const allLocales = require('../../_locales/index.json')
 
+const isSupported = extension.i18n && extension.i18n.getAcceptLanguages
+const getPreferredLocales = isSupported ? promisify(
+  extension.i18n.getAcceptLanguages,
+  { errorFirst: false }
+) : async () => []
+
 const existingLocaleCodes = allLocales.map(locale => locale.code.toLowerCase().replace('_', '-'))
 
 /**
@@ -12,10 +18,7 @@ const existingLocaleCodes = allLocales.map(locale => locale.code.toLowerCase().r
  *
  */
 async function getFirstPreferredLangCode () {
-  const userPreferredLocaleCodes = await promisify(
-    extension.i18n.getAcceptLanguages,
-    { errorFirst: false }
-  )()
+  const userPreferredLocaleCodes = await getPreferredLocales()
   const firstPreferredLangCode = userPreferredLocaleCodes
     .map(code => code.toLowerCase())
     .find(code => existingLocaleCodes.includes(code))
diff --git a/app/scripts/lib/setupRaven.js b/app/scripts/lib/setupRaven.js
index d164827ab..77aefb00a 100644
--- a/app/scripts/lib/setupRaven.js
+++ b/app/scripts/lib/setupRaven.js
@@ -66,7 +66,7 @@ function simplifyErrorMessages(report) {
 
 function rewriteErrorMessages(report, rewriteFn) {
   // rewrite top level message
-  report.message = rewriteFn(report.message)
+  if (report.message) report.message = rewriteFn(report.message)
   // rewrite each exception message
   if (report.exception && report.exception.values) {
     report.exception.values.forEach(item => {