diff --git a/.changeset/itchy-ways-tell.md b/.changeset/itchy-ways-tell.md
index d0a785d381c..a1c7ee93502 100644
--- a/.changeset/itchy-ways-tell.md
+++ b/.changeset/itchy-ways-tell.md
@@ -2,4 +2,4 @@
 "@clerk/shared": patch
 ---
 
-Use shared safe environment variable access in Netlify cache handler
+Make sure `process` is defined in environment when checking if application is running on Netlify.
diff --git a/packages/shared/src/__tests__/netlifyCacheHandler.test.ts b/packages/shared/src/__tests__/netlifyCacheHandler.test.ts
index 1bc2560ed16..b5bc9111cdf 100644
--- a/packages/shared/src/__tests__/netlifyCacheHandler.test.ts
+++ b/packages/shared/src/__tests__/netlifyCacheHandler.test.ts
@@ -60,4 +60,24 @@ describe('handleNetlifyCacheInDevInstance', () => {
 
     expect(requestStateHeaders.get('Location')).toBe('https://example.netlify.app');
   });
+
+  it('should ignore the URL environment variable if it is not a string', () => {
+    // @ts-expect-error - Random object
+    process.env.URL = {};
+    process.env.NETLIFY = 'true';
+
+    const requestStateHeaders = new Headers({
+      Location: 'https://example.netlify.app',
+    });
+    const locationHeader = requestStateHeaders.get('Location') || '';
+
+    handleNetlifyCacheInDevInstance({
+      locationHeader,
+      requestStateHeaders,
+      publishableKey: mockPublishableKey,
+    });
+
+    const locationUrl = new URL(requestStateHeaders.get('Location') || '');
+    expect(locationUrl.searchParams.has(CLERK_NETLIFY_CACHE_BUST_PARAM)).toBe(true);
+  });
 });
diff --git a/packages/shared/src/getEnvVariable.ts b/packages/shared/src/getEnvVariable.ts
index 795a016f902..5d3904a2d81 100644
--- a/packages/shared/src/getEnvVariable.ts
+++ b/packages/shared/src/getEnvVariable.ts
@@ -46,6 +46,5 @@ export const getEnvVariable = (name: string, context?: Record<string, any>): str
   } catch {
     // This will raise an error in Cloudflare Pages
   }
-
   return '';
 };
diff --git a/packages/shared/src/netlifyCacheHandler.ts b/packages/shared/src/netlifyCacheHandler.ts
index caf63216a08..3d43073a826 100644
--- a/packages/shared/src/netlifyCacheHandler.ts
+++ b/packages/shared/src/netlifyCacheHandler.ts
@@ -1,4 +1,4 @@
-import { getEnvVariable } from './getEnvVariable';
+/* eslint-disable turbo/no-undeclared-env-vars */
 import { isDevelopmentFromPublishableKey } from './keys';
 
 /**
@@ -11,6 +11,23 @@ import { isDevelopmentFromPublishableKey } from './keys';
  */
 export const CLERK_NETLIFY_CACHE_BUST_PARAM = '__clerk_netlify_cache_bust';
 
+/**
+ * Returns true if running in a Netlify environment.
+ * Checks for Netlify-specific environment variables in process.env.
+ * Safe for browser and non-Node environments.
+ */
+function isNetlifyRuntime(): boolean {
+  if (typeof process === 'undefined' || !process.env) {
+    return false;
+  }
+
+  return (
+    Boolean(process.env.NETLIFY) ||
+    Boolean(process.env.NETLIFY_FUNCTIONS_TOKEN) ||
+    (typeof process.env.URL === 'string' && process.env.URL.endsWith('netlify.app'))
+  );
+}
+
 /**
  * Prevents infinite redirects in Netlify's functions by adding a cache bust parameter
  * to the original redirect URL. This ensures that Netlify doesn't serve a cached response
@@ -32,12 +49,9 @@ export function handleNetlifyCacheInDevInstance({
   requestStateHeaders: Headers;
   publishableKey: string;
 }) {
-  const isOnNetlify =
-    getEnvVariable('NETLIFY') ||
-    (typeof getEnvVariable('URL') === 'string' && getEnvVariable('URL').endsWith('netlify.app')) ||
-    Boolean(getEnvVariable('NETLIFY_FUNCTIONS_TOKEN'));
-
+  const isOnNetlify = isNetlifyRuntime();
   const isDevelopmentInstance = isDevelopmentFromPublishableKey(publishableKey);
+
   if (isOnNetlify && isDevelopmentInstance) {
     const hasHandshakeQueryParam = locationHeader.includes('__clerk_handshake');
     // If location header is the original URL before the handshake flow, add cache bust param