diff --git a/node_modules/@auth/core/lib/utils/env.js b/node_modules/@auth/core/lib/utils/env.js
index 1234567..abcdefg 100644
--- a/node_modules/@auth/core/lib/utils/env.js
+++ b/node_modules/@auth/core/lib/utils/env.js
@@ -44,7 +44,12 @@ export function setEnvDefaults(envObject, config) {
         return finalProvider;
     });
 }
-export function createActionURL(action, protocol, headers, envObject, basePath) {
+export function createActionURL(action, protocol, headers, envObject, configOrBasePath) {
+    // Fix: Extract basePath from config object if needed
+    const basePath = typeof configOrBasePath === 'object' && configOrBasePath !== null
+        ? configOrBasePath.basePath
+        : configOrBasePath;
+
     let envUrl = envObject.AUTH_URL ?? envObject.NEXTAUTH_URL;
     let url;
     if (envUrl) {