We have this exception every time on each successfull Activity finish

Here is our Workflow:
class SimpleWorkflow extends Workflow
{
public function execute()
{
$result = yield ActivityStub::make(SimpleActivity::class);
$result2 = yield ActivityStub::make(SimpleActivity::class);
return 'workflow_' . $result . '_'. $result2;
}
}
Here is our Activity:
class SimpleActivity extends Activity
{
public function execute()
{
// Perform some work...
return 123;
}
}
We use Laravel 10 & Laravel Horizon with Redis Queue
We have this exception every time on each successfull Activity finish

Here is our Workflow:
Here is our Activity:
We use Laravel 10 & Laravel Horizon with Redis Queue