diff --git a/src/components/Alert.vue b/src/components/Alert.vue
index c7b5293..d7297b8 100644
--- a/src/components/Alert.vue
+++ b/src/components/Alert.vue
@@ -31,17 +31,16 @@ export default Vue.extend({
     };
   },
   created: function() {
-    const self = this;
-    this.$eventHub.$on("showError", function(text: string) {
-      self.level = AlertLevel.Error;
-      self.message = text;
+    this.$eventHub.$on("showError", (text: string) => {
+      this.level = AlertLevel.Error;
+      this.message = text;
     });
-    this.$eventHub.$on("showWarn", function(text: string) {
-      self.level = AlertLevel.Warn;
-      self.message = text;
+    this.$eventHub.$on("showWarn", (text: string) => {
+      this.level = AlertLevel.Warn;
+      this.message = text;
     });
-    this.$eventHub.$on("clearAlerts", function() {
-      self.message = null;
+    this.$eventHub.$on("clearAlerts", () => {
+      this.message = null;
     });
   }
 });
diff --git a/src/util/crypto.ts b/src/util/crypto.ts
index 5d1b752..6284c0e 100644
--- a/src/util/crypto.ts
+++ b/src/util/crypto.ts
@@ -92,7 +92,7 @@ function decrypt(
   salt: Uint8Array,
   passphrase: string,
   nonce: Uint8Array
-): Uint8Array {
+): Uint8Array | null {
   const key = SCRYPT(passphrase, Buffer.from(salt.buffer), 1 << 15, 8, 1, 32);
   // This is a false positive, `secretbox.open` is unrelated to `fs.open`
   // eslint-disable-next-line security/detect-non-literal-fs-filename
diff --git a/tests/unit/crypto.spec.ts b/tests/unit/crypto.spec.ts
index 994ef3b..87d680a 100644
--- a/tests/unit/crypto.spec.ts
+++ b/tests/unit/crypto.spec.ts
@@ -52,7 +52,7 @@ test("fails with incorrect password", () => {
   );
   var parsed = shards.map(s => crypto.parse(s));
   expect(() => crypto.reconstruct(parsed, "")).toThrow(
-    new Error("Unable to decrypt the secret")
+    "Unable to decrypt the secret"
   );
 });