diff --git a/src/GoTrueClient.ts b/src/GoTrueClient.ts
index 0e0c880d..5aafb625 100644
--- a/src/GoTrueClient.ts
+++ b/src/GoTrueClient.ts
@@ -1524,9 +1524,13 @@ export default class GoTrueClient {
    * Checks if the current URL contains parameters given by an implicit oauth grant flow (https://www.rfc-editor.org/rfc/rfc6749.html#section-4.2)
    */
   private _isImplicitGrantFlow(): boolean {
+    if (!isBrowser()) {
+      return false
+    }
+
     const params = parseParametersFromURL(window.location.href)
 
-    return !!(isBrowser() && (params.access_token || params.error_description))
+    return !!(params.access_token || params.error_description)
   }
 
   /**
diff --git a/src/lib/helpers.ts b/src/lib/helpers.ts
index 22e22c97..d940d1b4 100644
--- a/src/lib/helpers.ts
+++ b/src/lib/helpers.ts
@@ -14,7 +14,8 @@ export function uuid() {
   })
 }
 
-export const isBrowser = () => typeof document !== 'undefined'
+export const isBrowser = () =>
+  typeof window !== 'undefined' && typeof document !== 'undefined'
 
 const localStorageWriteTests = {
   tested: false,