diff --git a/src/js/auth.js b/src/js/auth.js
index dd560140..5094d62d 100644
--- a/src/js/auth.js
+++ b/src/js/auth.js
@@ -336,8 +336,9 @@ export class Auth {
     // Mark accounts with out-of-date scopes as "needsReauth"
     return accounts.map((account) => {
       const scopesOutOfDate =
-        getMissingScopes(account.scope ?? "", requiredScope, optionalScope)
-          .length > 0;
+        account.scope != null &&
+        getMissingScopes(account.scope, requiredScope, optionalScope).length >
+          0;
       return {
         ...account,
         needsReauth: account.needsReauth || scopesOutOfDate,
diff --git a/tests/unit/env.js b/tests/unit/env.js
index 22216dca..7c3e510b 100644
--- a/tests/unit/env.js
+++ b/tests/unit/env.js
@@ -22,6 +22,21 @@ globalThis.MutationObserver = dom.window.MutationObserver;
 globalThis.FileReader = dom.window.FileReader;
 globalThis.Blob = dom.window.Blob;
 globalThis.getComputedStyle = dom.window.getComputedStyle;
+
+// Matches head.html template
+globalThis.window.env = {
+  hostName: "localhost",
+  gitCommit: "test",
+  environment: "test",
+  version: "0.0.0",
+  pluginSdkFileName: "pluginSdk.test.js",
+  oauthScopes: "atproto",
+  oauthOptionalScopes: "",
+  playwright: false,
+  useConfidentialOauth: false,
+  oatproxyClientId: "",
+};
+
 // Node has its own global navigator; alias JSDOM's so code under test and
 // tests (which mock properties on window.navigator) see the same object.
 Object.defineProperty(globalThis, "navigator", {
diff --git a/tests/unit/specs/plugins/pluginBridge.test.js b/tests/unit/specs/plugins/pluginBridge.test.js
index ed7f177b..696c6025 100644
--- a/tests/unit/specs/plugins/pluginBridge.test.js
+++ b/tests/unit/specs/plugins/pluginBridge.test.js
@@ -1,10 +1,6 @@
 import { describe, it, beforeEach, afterEach } from "node:test";
 import assert from "node:assert/strict";
 
-// PluginBridge reads window.env.playwright during loadFromSource; provide it
-// so the import resolves cleanly. Individual tests avoid the real load path.
-globalThis.window.env = globalThis.window.env ?? { playwright: true };
-
 const {
   PluginBridge,
   PluginInstance,