From f4d7571c9e0957be50e05c8e5474c128aea3dbfd Mon Sep 17 00:00:00 2001
From: Johannes Meyer <johannes.meyer@icinga.com>
Date: Tue, 21 Jul 2026 14:35:40 +0200
Subject: [PATCH] Fix that `MillisecondTimestamp` converts null to int

---
 src/Behavior/MillisecondTimestamp.php      | 4 ++++
 tests/MillisecondTimestampBehaviorTest.php | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/src/Behavior/MillisecondTimestamp.php b/src/Behavior/MillisecondTimestamp.php
index 65d8033..76b818b 100644
--- a/src/Behavior/MillisecondTimestamp.php
+++ b/src/Behavior/MillisecondTimestamp.php
@@ -24,6 +24,10 @@ public function fromDb($value, $key, $context)
 
     public function toDb($value, $key, $context)
     {
+        if ($value === null) {
+            return null;
+        }
+
         if (is_numeric($value)) {
             return (int) ($value * 1000.0);
         }
diff --git a/tests/MillisecondTimestampBehaviorTest.php b/tests/MillisecondTimestampBehaviorTest.php
index 38e9585..a1045e4 100644
--- a/tests/MillisecondTimestampBehaviorTest.php
+++ b/tests/MillisecondTimestampBehaviorTest.php
@@ -15,6 +15,11 @@ public function testFromDbReturnsNullWhenNullIsPassed()
         $this->assertNull((new MillisecondTimestamp([]))->fromDb(null, 'key', null));
     }
 
+    public function testToDbReturnsNullWhenNullIsPassed()
+    {
+        $this->assertNull((new MillisecondTimestamp([]))->toDb(null, 'key', null));
+    }
+
     public function testToDbReturnsUtcTimestampWithNonUtcInput()
     {
         $sometime = DateTime::createFromFormat(