diff --git a/packages/core/src/client/call-server-error.ts b/packages/core/src/client/call-server-error.ts
new file mode 100644
index 0000000..b02d55e
--- /dev/null
+++ b/packages/core/src/client/call-server-error.ts
@@ -0,0 +1,12 @@
+export class CallServerError extends Error {
+  #statusCode: number;
+
+  constructor(message: string, statusCode: number) {
+    super(message);
+    this.#statusCode = statusCode;
+  }
+
+  get statusCode(): number {
+    return this.#statusCode;
+  }
+}
diff --git a/packages/core/src/client/call-server.ts b/packages/core/src/client/call-server.ts
index da4abc9..fac420e 100644
--- a/packages/core/src/client/call-server.ts
+++ b/packages/core/src/client/call-server.ts
@@ -1,5 +1,6 @@
 import type {ReactServerValue} from 'react-server-dom-webpack';
 import ReactServerDOMClient from 'react-server-dom-webpack/client.browser';
+import {CallServerError} from './call-server-error.js';
 
 export async function callServer(
   id: string,
@@ -10,6 +11,12 @@ export async function callServer(
       method: `POST`,
       headers: {'accept': `text/x-component`, 'x-rsc-action': id},
       body: await ReactServerDOMClient.encodeReply(args),
+    }).then((response) => {
+      if (response.ok) {
+        return response;
+      }
+
+      throw new CallServerError(response.statusText, response.status);
     }),
   );
 }
diff --git a/packages/core/src/client/index.ts b/packages/core/src/client/index.ts
index 2d90346..9a29cec 100644
--- a/packages/core/src/client/index.ts
+++ b/packages/core/src/client/index.ts
@@ -1,2 +1,3 @@
+export * from './call-server-error.js';
 export * from './link.js';
 export * from './use-router.js';