guard adainst raven erroring

app/scripts/background.js

@@ -261,7 +261,11 @@ function setupController (initState, initLangCode) {
   controller.txController.on(`tx:status-update`, (txId, status) => {
     if (status !== 'failed') return
     const txMeta = controller.txController.txStateManager.getTx(txId)
+    try {
       reportFailedTxToSentry({ raven, txMeta })
+    } catch (e) {
+      console.error(e)
+    }
   })
 
   // setup state persistence

app/scripts/lib/setupRaven.js

@@ -24,6 +24,7 @@ function setupRaven(opts) {
     transport: function(opts) {
       const report = opts.data
       // simplify certain complex error messages
+      if (report.exception && report.exception.values) {
         report.exception.values.forEach(item => {
           let errorMessage = item.value
           // simplify ethjs error messages
@@ -36,7 +37,7 @@ function setupRaven(opts) {
           // finalize
           item.value = errorMessage
         })
-
+      }
       // modify report urls
       rewriteReportUrls(report)
       // make request normally
@@ -52,12 +53,14 @@ function rewriteReportUrls(report) {
   // update request url
   report.request.url = toMetamaskUrl(report.request.url)
   // update exception stack trace
+  if (report.exception && report.exception.values) {
     report.exception.values.forEach(item => {
       item.stacktrace.frames.forEach(frame => {
         frame.filename = toMetamaskUrl(frame.filename)
       })
     })
   }
+}
 
 function toMetamaskUrl(origUrl) {
   const filePath = origUrl.split(location.origin)[1]