diff --git a/app/crc32.js b/app/crc32.js
index f6f7f5b6..ec6d67e6 100644
--- a/app/crc32.js
+++ b/app/crc32.js
@@ -1,4 +1,4 @@
-const LOOKUP = [
+const LOOKUP = Int32Array.from([
   0x00000000,
   0x77073096,
   0xee0e612c,
@@ -255,7 +255,7 @@ const LOOKUP = [
   0xc30c8ea1,
   0x5a05df1b,
   0x2d02ef8d
-];
+]);
 
 module.exports = function crc32(uint8Array, previous) {
   let crc = previous === 0 ? 0 : ~~previous ^ -1;
diff --git a/app/user.js b/app/user.js
index 6b857db0..49d8decb 100644
--- a/app/user.js
+++ b/app/user.js
@@ -99,7 +99,7 @@ export default class User {
   }
 
   get loginRequired() {
-    return this.authConfig.fxa_required;
+    return this.authConfig && this.authConfig.fxa_required;
   }
 
   async metricId() {