[BUG] Uninitialized string offset after upgrading to Symfony 4.1

[bigfoot90]

Symfony version(s) affected: 4.1

Description
After merge of commit 6089290
I got the error An exception has been thrown during the rendering of a template ("Notice: Uninitialized string offset: 0")

How to reproduce
Render a Controller from a Twig template like this:
{{ render(controller('Infrastructure\\Symfony\\Controller\\CommonPartsController::quickSearch')) }}

Additional context

ErrorException
Notice: Uninitialized string offset: 0

in /srv/vendor/symfony/http-foundation/Request.php (line 1989)
in /srv/vendor/symfony/http-foundation/Request.php->normalizeAndFilterClientIps (line 1952)
in /srv/vendor/symfony/http-foundation/Request.php->getTrustedValues (line 780)
in /srv/vendor/symfony/http-foundation/Request.php->getClientIps (line 799)
in /srv/vendor/symfony/http-kernel/Profiler/Profiler.php->getClientIp (line 154)
in /srv/vendor/symfony/http-kernel/EventListener/ProfilerListener.php->collect (line 91)
in /srv/vendor/symfony/event-dispatcher/Debug/WrappedListener.php->onKernelResponse (line 104)
in /srv/vendor/symfony/event-dispatcher/EventDispatcher.php->__invoke (line 212)
in /srv/vendor/symfony/event-dispatcher/EventDispatcher.php->doDispatch (line 44)
in /srv/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php->dispatch (line 141)
in /srv/vendor/symfony/http-kernel/HttpKernel.php->dispatch (line 187)
in /srv/vendor/symfony/http-kernel/HttpKernel.php->filterResponse (line 169)
in /srv/vendor/symfony/http-kernel/HttpKernel.php->handleRaw (line 66)
in /srv/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php->handle (line 81)
in /srv/vendor/symfony/http-kernel/Fragment/InlineFragmentRenderer.php::handle (line 80)
in /srv/vendor/symfony/http-kernel/Fragment/FragmentHandler.php->render (line 87)
in /srv/vendor/symfony/http-kernel/DependencyInjection/LazyLoadingFragmentHandler.php->render (line 45)
in /srv/vendor/symfony/twig-bridge/Extension/HttpKernelRuntime.php->render (line 46)
in /srv/var/cache/dev/twig/9e/9eb6412486206c3673e63daf0ce3c8f72ac9ecac27fc02c3dafad68618f3bab2.php->renderFragment (line 47)
in /srv/vendor/twig/twig/lib/Twig/Template.php->doDisplay (line 390)
in /srv/vendor/twig/twig/lib/Twig/Template.php->displayWithErrorHandling (line 367)
in /srv/var/cache/dev/twig/35/358e7a1e79bf54f792290ab080d44ef9dab359d175c5c363919ca784b3ecda3d.php->display (line 49)
in /srv/vendor/twig/twig/lib/Twig/Template.php->doDisplay (line 390)
in /srv/vendor/twig/twig/lib/Twig/Template.php->displayWithErrorHandling (line 367)
in /srv/var/cache/dev/twig/97/97a9c91193ffc1aad993506b278efab5329dea7ca3b768e986876e6643963797.php->display (line 44)
in /srv/vendor/twig/twig/lib/Twig/Template.php->doDisplay (line 390)
in /srv/vendor/twig/twig/lib/Twig/Template.php->displayWithErrorHandling (line 367)
in /srv/vendor/twig/twig/lib/Twig/Template.php->display (line 375)
in /srv/vendor/symfony/twig-bridge/TwigEngine.php->render (line 49)
in /srv/vendor/symfony/twig-bundle/TwigEngine.php->render (line 45)
in /srv/vendor/symfony/templating/DelegatingEngine.php->render (line 41)
in /srv/vendor/symfony/framework-bundle/Controller/ControllerTrait.php->render (line 222)
Controller->render('customer/index.html.twig', array('form' => object(FormView), 'customers' => array(object(Customer))))
in Symfony/Controller/Customer/IndexController.php (line 31)
in /srv/vendor/symfony/http-kernel/HttpKernel.php->index (line 149)
in /srv/vendor/symfony/http-kernel/HttpKernel.php->handleRaw (line 66)
in /srv/vendor/symfony/http-kernel/Kernel.php->handle (line 188)
Kernel->handle(object(Request))
in /srv/public/index.php (line 28)

[nicolas-grekas]

Fixed in #28241