diff --git a/frontend/src/pages/settings/GeneralTab.tsx b/frontend/src/pages/settings/GeneralTab.tsx
index df7a3f395..2c1ae840d 100644
--- a/frontend/src/pages/settings/GeneralTab.tsx
+++ b/frontend/src/pages/settings/GeneralTab.tsx
@@ -170,7 +170,7 @@ export default function GeneralTab({ allSetting, updateSetting }: GeneralTabProp
 
             <SettingListItem paddings="small" title={t('pages.settings.panelPort')} description={t('pages.settings.panelPortDesc')}>
               <InputNumber value={allSetting.webPort} min={1} max={65535} style={{ width: '100%' }}
-                onChange={(v) => updateSetting({ webPort: Number(v) || 0 })} />
+                onChange={(v) => { if (v != null) updateSetting({ webPort: v }); }} />
             </SettingListItem>
 
             <SettingListItem paddings="small" title={t('pages.settings.panelUrlPath')} description={t('pages.settings.panelUrlPathDesc')}>
@@ -308,7 +308,7 @@ export default function GeneralTab({ allSetting, updateSetting }: GeneralTabProp
             </SettingListItem>
             <SettingListItem paddings="small" title={t('pages.settings.ldap.port')}>
               <InputNumber value={allSetting.ldapPort} min={1} max={65535} style={{ width: '100%' }}
-                onChange={(v) => updateSetting({ ldapPort: Number(v) || 0 })} />
+                onChange={(v) => { if (v != null) updateSetting({ ldapPort: v }); }} />
             </SettingListItem>
             <SettingListItem paddings="small" title={t('pages.settings.ldap.useTls')}>
               <Switch checked={allSetting.ldapUseTLS} onChange={(v) => updateSetting({ ldapUseTLS: v })} />
diff --git a/frontend/src/pages/settings/SubscriptionGeneralTab.tsx b/frontend/src/pages/settings/SubscriptionGeneralTab.tsx
index e94c8a877..c2ba1f833 100644
--- a/frontend/src/pages/settings/SubscriptionGeneralTab.tsx
+++ b/frontend/src/pages/settings/SubscriptionGeneralTab.tsx
@@ -57,7 +57,7 @@ export default function SubscriptionGeneralTab({ allSetting, updateSetting }: Su
             </SettingListItem>
             <SettingListItem paddings="small" title={t('pages.settings.subPort')} description={t('pages.settings.subPortDesc')}>
               <InputNumber value={allSetting.subPort} min={1} max={65535} style={{ width: '100%' }}
-                onChange={(v) => updateSetting({ subPort: Number(v) || 0 })} />
+                onChange={(v) => { if (v != null) updateSetting({ subPort: v }); }} />
             </SettingListItem>
             <SettingListItem paddings="small" title={t('pages.settings.subPath')} description={t('pages.settings.subPathDesc')}>
               <Input
diff --git a/frontend/src/test/subscription-general-tab.test.tsx b/frontend/src/test/subscription-general-tab.test.tsx
index 424046e19..fbc4914a5 100644
--- a/frontend/src/test/subscription-general-tab.test.tsx
+++ b/frontend/src/test/subscription-general-tab.test.tsx
@@ -12,6 +12,36 @@ function LocationProbe() {
 }
 
 describe('SubscriptionGeneralTab', () => {
+  it('keeps the stored subscription port when the field is cleared', () => {
+    const updateSetting = vi.fn();
+
+    renderWithProviders(
+      <MemoryRouter initialEntries={['/settings#subscription']}>
+        <SubscriptionGeneralTab allSetting={new AllSetting({ subPort: 2096 })} updateSetting={updateSetting} />
+      </MemoryRouter>,
+    );
+
+    const portInput = screen.getByDisplayValue('2096');
+    fireEvent.change(portInput, { target: { value: '' } });
+    fireEvent.blur(portInput);
+
+    expect(updateSetting).not.toHaveBeenCalled();
+  });
+
+  it('forwards typed subscription ports unchanged', () => {
+    const updateSetting = vi.fn();
+
+    renderWithProviders(
+      <MemoryRouter initialEntries={['/settings#subscription']}>
+        <SubscriptionGeneralTab allSetting={new AllSetting({ subPort: 2096 })} updateSetting={updateSetting} />
+      </MemoryRouter>,
+    );
+
+    fireEvent.change(screen.getByDisplayValue('2096'), { target: { value: '8443' } });
+
+    expect(updateSetting).toHaveBeenCalledWith({ subPort: 8443 });
+  });
+
   it('uses router navigation to open subscription format settings', () => {
     const allSetting = new AllSetting({ subClashEnable: true });