Trying to access array offset on value of type null in mail queue

[etc-develop]

I'm using laravel 10.
Symfony/mailer version: v6.4.6
When I send a mail by queue, it "sometimes" failed,like below messages in queue:

ErrorException: Trying to access array offset on value of type null in .\vendor\symfony\mailer\Transport\Smtp\Stream\AbstractStream.php:91
Stack trace:
#0 .\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\HandleExceptions.php(255): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 .\vendor\symfony\mailer\Transport\Smtp\Stream\AbstractStream.php(91): Illuminate\Foundation\Bootstrap\HandleExceptions->Illuminate\Foundation\Bootstrap\{closure}()
#2 .\vendor\symfony\mailer\Transport\Smtp\SmtpTransport.php(346): Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream->readLine()
#3 .\vendor\symfony\mailer\Transport\Smtp\SmtpTransport.php(196): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->getFullResponse()
#4 .\vendor\symfony\mailer\Transport\Smtp\EsmtpTransport.php(118): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->executeCommand()
#5 .\vendor\symfony\mailer\Transport\Smtp\SmtpTransport.php(141): Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport->executeCommand()
#6 .\vendor\laravel\framework\src\Illuminate\Mail\Mailer.php(573): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->send()
#7 .\vendor\laravel\framework\src\Illuminate\Mail\Mailer.php(335): Illuminate\Mail\Mailer->sendSymfonyMessage()
#8 .\vendor\laravel\framework\src\Illuminate\Mail\Mailable.php(213): Illuminate\Mail\Mailer->send()
#9 .\vendor\laravel\framework\src\Illuminate\Support\Traits\Localizable.php(19): Illuminate\Mail\Mailable->Illuminate\Mail\{closure}()
#10 .\vendor\laravel\framework\src\Illuminate\Mail\Mailable.php(214): Illuminate\Mail\Mailable->withLocale()
#11 .\vendor\laravel\framework\src\Illuminate\Mail\SendQueuedMailable.php(83): Illuminate\Mail\Mailable->send()
#12 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(36): Illuminate\Mail\SendQueuedMailable->handle()
#13 .\vendor\laravel\framework\src\Illuminate\Container\Util.php(41): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#14 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(93): Illuminate\Container\Util::unwrapIfClosure()
#15 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(37): Illuminate\Container\BoundMethod::callBoundMethod()
#16 .\vendor\laravel\framework\src\Illuminate\Container\Container.php(662): Illuminate\Container\BoundMethod::call()
#17 .\vendor\laravel\framework\src\Illuminate\Bus\Dispatcher.php(128): Illuminate\Container\Container->call()
#18 .\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(144): Illuminate\Bus\Dispatcher->Illuminate\Bus\{closure}()
#19 .\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(119): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#20 .\vendor\laravel\framework\src\Illuminate\Bus\Dispatcher.php(132): Illuminate\Pipeline\Pipeline->then()
#21 .\vendor\laravel\framework\src\Illuminate\Queue\CallQueuedHandler.php(124): Illuminate\Bus\Dispatcher->dispatchNow()
#22 .\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(144): Illuminate\Queue\CallQueuedHandler->Illuminate\Queue\{closure}()
#23 .\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(119): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#24 .\vendor\laravel\framework\src\Illuminate\Queue\CallQueuedHandler.php(126): Illuminate\Pipeline\Pipeline->then()
#25 .\vendor\laravel\framework\src\Illuminate\Queue\CallQueuedHandler.php(70): Illuminate\Queue\CallQueuedHandler->dispatchThroughMiddleware()
#26 .\vendor\laravel\framework\src\Illuminate\Queue\Jobs\Job.php(102): Illuminate\Queue\CallQueuedHandler->call()
#27 .\vendor\laravel\framework\src\Illuminate\Queue\Worker.php(439): Illuminate\Queue\Jobs\Job->fire()
#28 .\vendor\laravel\framework\src\Illuminate\Queue\Worker.php(389): Illuminate\Queue\Worker->process()
#29 .\vendor\laravel\framework\src\Illuminate\Queue\Worker.php(176): Illuminate\Queue\Worker->runJob()
#30 .\vendor\laravel\framework\src\Illuminate\Queue\Console\WorkCommand.php(138): Illuminate\Queue\Worker->daemon()
#31 .\vendor\laravel\framework\src\Illuminate\Queue\Console\WorkCommand.php(121): Illuminate\Queue\Console\WorkCommand->runWorker()
#32 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(36): Illuminate\Queue\Console\WorkCommand->handle()
#33 .\vendor\laravel\framework\src\Illuminate\Container\Util.php(41): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#34 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(93): Illuminate\Container\Util::unwrapIfClosure()
#35 .\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php(37): Illuminate\Container\BoundMethod::callBoundMethod()
#36 .\vendor\laravel\framework\src\Illuminate\Container\Container.php(662): Illuminate\Container\BoundMethod::call()
#37 .\vendor\laravel\framework\src\Illuminate\Console\Command.php(211): Illuminate\Container\Container->call()
#38 .\vendor\symfony\console\Command\Command.php(326): Illuminate\Console\Command->execute()
#39 .\vendor\laravel\framework\src\Illuminate\Console\Command.php(181): Symfony\Component\Console\Command\Command->run()
#40 .\vendor\symfony\console\Application.php(1096): Illuminate\Console\Command->run()
#41 .\vendor\symfony\console\Application.php(324): Symfony\Component\Console\Application->doRunCommand()
#42 .\vendor\symfony\console\Application.php(175): Symfony\Component\Console\Application->doRun()
#43 .\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.php(201): Symfony\Component\Console\Application->run()
#44 .\artisan(35): Illuminate\Foundation\Console\Kernel->handle()
#45 {main}

When it failed and save in failed_jobs,and then I use php artisan queue:retry {uuid} command can resend success.
Log not saying something wrong in my code,so I cannot know where to fix, anyone can help me?

[msoler75]

Same here. Error is in :

AbstractStream.php:91:

throw new TransportException(sprintf('Unable to read from connection to "%s": ', $this->getReadConnectionDescription()).error_get_last()['message']);

It seems that accessing to ['message'] key on null throws the error.

I get the solution replacing code with:

        $lastError = error_get_last();
        if ($lastError === null) {
            throw new TransportException(sprintf('Unable to read from connection to "%s" and error_get_last() returned null', $this->getReadConnectionDescription()));
        } else {
            throw new TransportException(sprintf('Unable to read from connection to "%s": %s', $this->getReadConnectionDescription(), $lastError['message']));
        }