The process has been signaled with signal "4" when running tests

When running tests for my Inertia + Vue app, I get the error in the title. Logs here:

[2025-11-26 00:59:39] local.ERROR: The process has been signaled with signal "4". {"exception":"[object] (Symfony\\Component\\Process\\Exception\\ProcessSignaledException(code: 0): The process has been signaled with signal \"4\". at /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/process/Process.php:461)
[stacktrace]
#0 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/process/Process.php(251): Symfony\\Component\\Process\\Process->wait()
#1 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/nunomaduro/collision/src/Adapters/Laravel/Commands/TestCommand.php(119): Symfony\\Component\\Process\\Process->run(Object(Closure))
#2 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): NunoMaduro\\Collision\\Adapters\\Laravel\\Commands\\TestCommand->handle()
#3 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Container/Util.php(43): Illuminate\\Container\\BoundMethod::{closure:Illuminate\\Container\\BoundMethod::call():35}()
#4 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(96): Illuminate\\Container\\Util::unwrapIfClosure(Object(Closure))
#5 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(35): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#6 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Container/Container.php(836): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#7 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Console/Command.php(211): Illuminate\\Container\\Container->call(Array)
#8 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/console/Command/Command.php(318): Illuminate\\Console\\Command->execute(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\OutputStyle))
#9 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Console/Command.php(180): Symfony\\Component\\Console\\Command\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\OutputStyle))
#10 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/console/Application.php(1073): Illuminate\\Console\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#11 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/console/Application.php(356): Symfony\\Component\\Console\\Application->doRunCommand(Object(NunoMaduro\\Collision\\Adapters\\Laravel\\Commands\\TestCommand), Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#12 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/symfony/console/Application.php(195): Symfony\\Component\\Console\\Application->doRun(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#13 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(197): Symfony\\Component\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#14 /home/ubuntuserver/PhpstormProjects/shelvdgg/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(1235): Illuminate\\Foundation\\Console\\Kernel->handle(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#15 /home/ubuntuserver/PhpstormProjects/shelvdgg/artisan(16): Illuminate\\Foundation\\Application->handleCommand(Object(Symfony\\Component\\Console\\Input\\ArgvInput))
#16 {main}
"}