diff --git a/.changeset/khaki-shirts-deliver.md b/.changeset/khaki-shirts-deliver.md
new file mode 100644
index 0000000..2aae847
--- /dev/null
+++ b/.changeset/khaki-shirts-deliver.md
@@ -0,0 +1,7 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+fix: delete init.cache rather than assign undefined
+
+Assigning undefined to init.cache throws when using NextAuth
diff --git a/packages/cloudflare/src/cli/build/bundle-server.ts b/packages/cloudflare/src/cli/build/bundle-server.ts
index 6af72db..81b5eed 100644
--- a/packages/cloudflare/src/cli/build/bundle-server.ts
+++ b/packages/cloudflare/src/cli/build/bundle-server.ts
@@ -94,7 +94,7 @@ fetch = globalThis.fetch;
 const CustomRequest = class extends globalThis.Request {
   constructor(input, init) {
     if (init) {
-      init.cache = undefined;
+      delete init.cache;
       // https://github.com/cloudflare/workerd/issues/2746
       // https://github.com/cloudflare/workerd/issues/3245
       Object.defineProperty(init, "body", {