diff --git a/.changeset/wild-insects-design.md b/.changeset/wild-insects-design.md
new file mode 100644
index 00000000000..b0051fad7ec
--- /dev/null
+++ b/.changeset/wild-insects-design.md
@@ -0,0 +1,5 @@
+---
+"@clerk/ui": patch
+---
+
+Fixed unhandled TypeError when `unsafeMetadata` is passed to `<SignUp />`
diff --git a/packages/ui/src/components/SignUp/SignUpStart.tsx b/packages/ui/src/components/SignUp/SignUpStart.tsx
index 8400c8984ce..e719bbaf5c3 100644
--- a/packages/ui/src/components/SignUp/SignUpStart.tsx
+++ b/packages/ui/src/components/SignUp/SignUpStart.tsx
@@ -259,7 +259,15 @@ function SignUpStartInternal(): JSX.Element {
     }, [] as Array<FormControlState>);
 
     if (unsafeMetadata) {
-      fieldsToSubmit.push({ id: 'unsafeMetadata', value: unsafeMetadata } as any);
+      const noop = () => {};
+      fieldsToSubmit.push({
+        id: 'unsafeMetadata',
+        value: unsafeMetadata,
+        clearFeedback: noop,
+        setValue: noop,
+        onChange: noop,
+        setError: noop,
+      } as any);
     }
 
     if (fields.ticket || hasExistingSignUpWithTicket) {
diff --git a/packages/ui/src/components/SignUp/__tests__/SignUpStart.test.tsx b/packages/ui/src/components/SignUp/__tests__/SignUpStart.test.tsx
index e85ee5184fa..d5f4349e365 100644
--- a/packages/ui/src/components/SignUp/__tests__/SignUpStart.test.tsx
+++ b/packages/ui/src/components/SignUp/__tests__/SignUpStart.test.tsx
@@ -1,3 +1,4 @@
+import { ClerkAPIResponseError } from '@clerk/shared/error';
 import { OAUTH_PROVIDERS } from '@clerk/shared/oauth';
 import type { SignUpResource } from '@clerk/shared/types';
 import { describe, expect, it, vi } from 'vitest';
@@ -522,4 +523,57 @@ describe('SignUpStart', () => {
       await waitFor(() => screen.getByText(/create your account/i));
     });
   });
+
+  describe('unsafeMetadata', () => {
+    it('does not throw when signUp.create rejects with an API error', async () => {
+      Object.defineProperty(window, 'location', {
+        writable: true,
+        value: { href: 'http://localhost/sign-up' },
+      });
+
+      let unhandledError: unknown = null;
+      const onUnhandledRejection = (reason: unknown) => {
+        unhandledError = reason;
+      };
+      process.on('unhandledRejection', onUnhandledRejection);
+
+      const { wrapper, fixtures, props } = await createFixtures(f => {
+        f.withEmailAddress({ required: true });
+        f.withPassword({ required: true });
+      });
+      fixtures.signUp.create.mockRejectedValueOnce(
+        new ClerkAPIResponseError('Error', {
+          data: [
+            {
+              code: 'form_password_pwned',
+              long_message: 'Password has been found in an online data breach.',
+              message: 'Password has been found in an online data breach.',
+              meta: { param_name: 'password' },
+            },
+          ],
+          status: 422,
+        }),
+      );
+      props.setProps({ unsafeMetadata: { foo: 'bar' } });
+
+      const { userEvent } = render(
+        <CardStateProvider>
+          <SignUpStart />
+        </CardStateProvider>,
+        { wrapper },
+      );
+
+      await userEvent.type(screen.getByLabelText(/email address/i), 'test@example.com');
+      await userEvent.type(screen.getByPlaceholderText(/create a password/i), 'password123');
+      await userEvent.click(screen.getByText(/continue/i));
+
+      await waitFor(() => expect(fixtures.signUp.create).toHaveBeenCalled());
+      await screen.findByTestId('form-feedback-error');
+      // Flush pending microtasks so any unhandled rejection event has a chance to fire.
+      await new Promise(resolve => setTimeout(resolve, 0));
+
+      process.off('unhandledRejection', onUnhandledRejection);
+      expect(unhandledError).toBeNull();
+    });
+  });
 });