diff --git a/packages/frontend/i18n/src/utils/__tests__/time.spec.ts b/packages/frontend/i18n/src/utils/__tests__/time.spec.ts
index 651d44625b..44321a4b18 100644
--- a/packages/frontend/i18n/src/utils/__tests__/time.spec.ts
+++ b/packages/frontend/i18n/src/utils/__tests__/time.spec.ts
@@ -396,4 +396,9 @@ describe('humanTime', () => {
       })
     ).toBe('本月');
   });
+
+  test('invalid time', () => {
+    createI18n();
+    expect(i18nTime('foobar')).toBe('');
+  });
 });
diff --git a/packages/frontend/i18n/src/utils/time.ts b/packages/frontend/i18n/src/utils/time.ts
index 4d7e015471..a1e3bae92e 100644
--- a/packages/frontend/i18n/src/utils/time.ts
+++ b/packages/frontend/i18n/src/utils/time.ts
@@ -73,6 +73,10 @@ export function i18nTime(
 ) {
   const i18n = options.i18n ?? I18n;
   time = dayjs(time);
+  if (!time.isValid()) {
+    return ''; // invalid time, return empty string
+  }
+
   const now = dayjs(options.now);
 
   const defaultRelativeOption = {