From d42685025da89a62a32c948bbd736d2a1e9e9ab1 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Wed, 14 Oct 2026 17:55:47 +0200
Subject: [PATCH] Avoid exception in constraint for value which is not a string

---
 .../lib/validator-constraints/is-not-in-the-future.spec.ts | 6 ++++++
 .../src/lib/validator-constraints/is-not-in-the-future.ts  | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/libs/common/src/lib/validator-constraints/is-not-in-the-future.spec.ts b/libs/common/src/lib/validator-constraints/is-not-in-the-future.spec.ts
index 4b9de73837..4ab85b2942 100644
--- a/libs/common/src/lib/validator-constraints/is-not-in-the-future.spec.ts
+++ b/libs/common/src/lib/validator-constraints/is-not-in-the-future.spec.ts
@@ -26,4 +26,10 @@ describe('IsNotInTheFutureConstraint', () => {
   it('Refuses a date in the future', () => {
     expect(constraint.validate('2026-09-05')).toBe(false);
   });
+
+  it('Leaves a value which is not a string to IsISO8601', () => {
+    expect(constraint.validate(undefined)).toBe(true);
+    expect(constraint.validate(null)).toBe(true);
+    expect(constraint.validate(123)).toBe(true);
+  });
 });
diff --git a/libs/common/src/lib/validator-constraints/is-not-in-the-future.ts b/libs/common/src/lib/validator-constraints/is-not-in-the-future.ts
index 6de91e9e3f..0ea6685e45 100644
--- a/libs/common/src/lib/validator-constraints/is-not-in-the-future.ts
+++ b/libs/common/src/lib/validator-constraints/is-not-in-the-future.ts
@@ -15,7 +15,12 @@ export class IsNotInTheFutureConstraint implements ValidatorConstraintInterface
     return '$property must not be a date in the future';
   }
 
-  public validate(aDate: string) {
+  public validate(aDate: unknown) {
+    // IsISO8601 refuses a value which is not a string
+    if (typeof aDate !== 'string') {
+      return true;
+    }
+
     return !isAccountBalanceInFuture({ date: resetHours(parseISO(aDate)) });
   }
 }