The process has been signaled with signal "9"

Hi!
Any idea what this logged error could be on v5.5.124-W118?

[2023-06-08 12:01:15] production.ERROR: The process has been signaled with signal "9". {"exception":"[object] (Symfony\\Component\\Process\\Exception\\ProcessSignaledException(code: 0): The process has been signaled with signal \"9\". at vendor/symfony/process/Process.php:434)
[stacktrace]
#0 vendor/symfony/process/Process.php(249): Symfony\\Component\\Process\\Process->wait()
#1 vendor/laravel/framework/src/Illuminate/Console/Scheduling/Event.php(255): Symfony\\Component\\Process\\Process->run()
#2 vendor/laravel/framework/src/Illuminate/Console/Scheduling/Event.php(237): Illuminate\\Console\\Scheduling\\Event->execute(Object(Illuminate\\Foundation\\Application))
#3 vendor/laravel/framework/src/Illuminate/Console/Scheduling/Event.php(207): Illuminate\\Console\\Scheduling\\Event->start(Object(Illuminate\\Foundation\\Application))
#4 vendor/laravel/framework/src/Illuminate/Console/Scheduling/ScheduleRunCommand.php(184): Illuminate\\Console\\Scheduling\\Event->run(Object(Illuminate\\Foundation\\Application))
#5 vendor/laravel/framework/src/Illuminate/Console/View/Components/Task.php(37): Illuminate\\Console\\Scheduling\\ScheduleRunCommand->Illuminate\\Console\\Scheduling\\{closure}()
#6 vendor/laravel/framework/src/Illuminate/Console/View/Components/Factory.php(58): Illuminate\\Console\\View\\Components\\Task->render('<fg=gray>2023-0...', Object(Closure))
#7 vendor/laravel/framework/src/Illuminate/Console/Scheduling/ScheduleRunCommand.php(199): Illuminate\\Console\\View\\Components\\Factory->__call('task', Array)
#8 vendor/laravel/framework/src/Illuminate/Console/Scheduling/ScheduleRunCommand.php(127): Illuminate\\Console\\Scheduling\\ScheduleRunCommand->runEvent(Object(Illuminate\\Console\\Scheduling\\Event))
#9 vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Illuminate\\Console\\Scheduling\\ScheduleRunCommand->handle(Object(Illuminate\\Console\\Scheduling\\Schedule), Object(Illuminate\\Events\\Dispatcher), Object(App\\Exceptions\\Handler))
#10 vendor/laravel/framework/src/Illuminate/Container/Util.php(41): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#11 vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(93): Illuminate\\Container\\Util::unwrapIfClosure(Object(Closure))
#12 vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(37): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#13 vendor/laravel/framework/src/Illuminate/Container/Container.php(661): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#14 vendor/laravel/framework/src/Illuminate/Console/Command.php(183): Illuminate\\Container\\Container->call(Array)
#15 vendor/symfony/console/Command/Command.php(312): Illuminate\\Console\\Command->execute(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\OutputStyle))
#16 vendor/laravel/framework/src/Illuminate/Console/Command.php(153): Symfony\\Component\\Console\\Command\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\OutputStyle))
#17 vendor/symfony/console/Application.php(1022): Illuminate\\Console\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#18 vendor/symfony/console/Application.php(314): Symfony\\Component\\Console\\Application->doRunCommand(Object(Illuminate\\Console\\Scheduling\\ScheduleRunCommand), Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#19 vendor/symfony/console/Application.php(168): Symfony\\Component\\Console\\Application->doRun(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#20 vendor/laravel/framework/src/Illuminate/Console/Application.php(102): Symfony\\Component\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#21 vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(155): Illuminate\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#22 artisan(37): Illuminate\\Foundation\\Console\\Kernel->handle(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#23 {main}
"}

Hi,

Which providers are you using to generate PDFs and send emails?

Hi @hillel
thanks for your reply!
SMTP and InvoiceNinja Hosted PDF.

Maybe the info here will help, it’s a similar error: