Slim Application Error

The application could not run because of the following error:

Details

Type: TypeError
Code: 0
Message: getInputValue(): Argument #3 ($charset) must be of type string, null given, called in /var/www/html/lfi/app/routes/kontaktformular.php on line 95
File: /var/www/html/lfi/app/routes/kontaktformular.php
Line: 112

Trace

#0 /var/www/html/lfi/app/routes/kontaktformular.php(95): getInputValue()
#1 /var/www/html/lfi/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(38): Closure->{closure}()
#2 /var/www/html/lfi/vendor/slim/slim/Slim/Routing/Route.php(358): Slim\Handlers\Strategies\RequestResponse->__invoke()
#3 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\Routing\Route->handle()
#4 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\MiddlewareDispatcher->handle()
#5 /var/www/html/lfi/vendor/slim/slim/Slim/Routing/Route.php(315): Slim\MiddlewareDispatcher->handle()
#6 /var/www/html/lfi/vendor/slim/slim/Slim/Routing/RouteRunner.php(68): Slim\Routing\Route->run()
#7 /var/www/html/lfi/vendor/slim/twig-view/src/TwigMiddleware.php(115): Slim\Routing\RouteRunner->handle()
#8 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Slim\Views\TwigMiddleware->process()
#9 /var/www/html/lfi/vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php(76): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#10 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Slim\Middleware\ErrorMiddleware->process()
#11 /var/www/html/lfi/src/class/Routing/Middleware/CspHeaderMiddleware.php(32): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#12 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): LFI\Routing\Middleware\CspHeaderMiddleware->__invoke()
#13 /var/www/html/lfi/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#14 /var/www/html/lfi/vendor/slim/slim/Slim/App.php(199): Slim\MiddlewareDispatcher->handle()
#15 /var/www/html/lfi/vendor/slim/slim/Slim/App.php(183): Slim\App->handle()
#16 /var/www/html/lfi/app/app.php(76): Slim\App->run()
#17 /var/www/html/lfi/public/index.php(3): require_once('...')
#18 {main}
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