From 1298d4736e83e0cb2d1a3cf67662ee2e5749147e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=BCrg=C3=BCn=20Day=C4=B1o=C4=9Flu?= <hey@gurgun.day>
Date: Wed, 26 Feb 2025 22:17:31 +0100
Subject: [PATCH] timers: check for immediate instance in clearImmediate

---
 lib/timers.js                              |  2 +-
 test/parallel/test-timers-invalid-clear.js | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 test/parallel/test-timers-invalid-clear.js

diff --git a/lib/timers.js b/lib/timers.js
index 8884137a808174..5a5e89f0bb420b 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -301,7 +301,7 @@ ObjectDefineProperty(setImmediate, customPromisify, {
  * @returns {void}
  */
 function clearImmediate(immediate) {
-  if (!immediate || immediate._destroyed)
+  if (!immediate?._onImmediate || immediate._destroyed)
     return;
 
   immediateInfo[kCount]--;
diff --git a/test/parallel/test-timers-invalid-clear.js b/test/parallel/test-timers-invalid-clear.js
new file mode 100644
index 00000000000000..b7d046794c5dee
--- /dev/null
+++ b/test/parallel/test-timers-invalid-clear.js
@@ -0,0 +1,13 @@
+'use strict';
+
+const common = require('../common');
+
+// clearImmediate should be a noop if anything other than an Immediate
+// is passed to it.
+
+const t = setTimeout(common.mustCall());
+
+clearImmediate(t);
+
+setTimeout(common.mustCall());
+setTimeout(common.mustCall());