Slim Application Error

The application could not run because of the following error:

Details

Type: ErrorException
Code: 8
Message: Undefined variable: title
File: /nauka-spiewu/client/view/include/public_header.php
Line: 9

Trace

#0 /nauka-spiewu/client/view/include/public_header.php(9): Slim\Slim::handleErrors(8, 'Undefined varia...', '/nauka-spiewu/c...', 9, Array)
#1 /nauka-spiewu/client/view/shop-product.php(1): require_once('/nauka-spiewu/c...')
#2 /nauka-spiewu/server/vendor/Slim/View.php(278): require('/nauka-spiewu/c...')
#3 /nauka-spiewu/server/vendor/Slim/View.php(255): Slim\View->render('/shop-product.p...', Array)
#4 /nauka-spiewu/server/vendor/Slim/View.php(243): Slim\View->fetch('/shop-product.p...', NULL)
#5 /nauka-spiewu/server/vendor/Slim/Slim.php(757): Slim\View->display('/shop-product.p...')
#6 /nauka-spiewu/index.php(635): Slim\Slim->render('/shop-product.p...')
#7 [internal function]: {closure}()
#8 /nauka-spiewu/server/vendor/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)
#9 /nauka-spiewu/server/vendor/Slim/Slim.php(1338): Slim\Route->dispatch()
#10 /nauka-spiewu/server/vendor/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#11 /nauka-spiewu/server/vendor/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#12 /nauka-spiewu/server/vendor/Slim/Middleware/ContentTypes.php(81): Slim\Middleware\MethodOverride->call()
#13 /nauka-spiewu/server/vendor/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\ContentTypes->call()
#14 /nauka-spiewu/server/vendor/Slim/Slim.php(1283): Slim\Middleware\PrettyExceptions->call()
#15 /nauka-spiewu/index.php(1276): Slim\Slim->run()
#16 {main}