From a127e2320b35a9065e9c4ac37ae10780b516856b Mon Sep 17 00:00:00 2001
From: Josh Salway <josh.salway@gmail.com>
Date: Thu, 2 Apr 2026 09:56:12 +1000
Subject: [PATCH] [12.x] Fix closure in chain not dispatched after batch
 completes

When Bus::chain contains a closure after a Bus::batch, the closure
fails with 'Call to undefined method Closure::getClosure()'.

This happens because attachRemainderOfChainToEndOfBatch() captures
the next chain item (a CallQueuedClosure containing a
SerializableClosure) directly in the batch's finally callback.
When the batch serializes this callback, the nested
SerializableClosure gets unwrapped to a raw Closure during the
round-trip.

Fix by re-serializing the next chain item to a string before
capturing it in the finally closure.
---
 src/Illuminate/Bus/ChainedBatch.php         |  4 +++-
 tests/Integration/Queue/JobChainingTest.php | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Bus/ChainedBatch.php b/src/Illuminate/Bus/ChainedBatch.php
index 7dc1a39ecaab..19e77017a19e 100644
--- a/src/Illuminate/Bus/ChainedBatch.php
+++ b/src/Illuminate/Bus/ChainedBatch.php
@@ -130,9 +130,11 @@ protected function attachRemainderOfChainToEndOfBatch(PendingBatch $batch)
             $next->chainQueue = $this->chainQueue;
             $next->chainCatchCallbacks = $this->chainCatchCallbacks;
 
+            $next = serialize($next);
+
             $batch->finally(function (Batch $batch) use ($next) {
                 if (! $batch->cancelled()) {
-                    Container::getInstance()->make(Dispatcher::class)->dispatch($next);
+                    Container::getInstance()->make(Dispatcher::class)->dispatch(unserialize($next));
                 }
             });
 
diff --git a/tests/Integration/Queue/JobChainingTest.php b/tests/Integration/Queue/JobChainingTest.php
index ba802b66cc37..986e4f65d100 100644
--- a/tests/Integration/Queue/JobChainingTest.php
+++ b/tests/Integration/Queue/JobChainingTest.php
@@ -470,6 +470,24 @@ public function testBatchCanBeAddedToChain()
         $this->assertEquals(['c1', 'c2', 'b1', 'b2', 'b3', 'b4', 'c3'], JobRunRecorder::$results);
     }
 
+    public function testClosureAfterBatchInChainIsDispatched()
+    {
+        Bus::chain([
+            new JobChainingNamedTestJob('c1'),
+            Bus::batch([
+                new JobChainingTestBatchedJob('b1'),
+                new JobChainingTestBatchedJob('b2'),
+            ]),
+            function () {
+                JobRunRecorder::record('closure-after-batch');
+            },
+        ])->dispatch();
+
+        $this->runQueueWorkerCommand(['--stop-when-empty' => true]);
+
+        $this->assertContains('closure-after-batch', JobRunRecorder::$results);
+    }
+
     public function testBatchInChainUsesCorrectQueue()
     {
         $otherQueue = $this->getQueueDriver() === 'redis' ? '{other}' : 'other';