Deprecated (8192): trim(): Passing null to parameter #1 ($string) of type string is deprecated [APP/Controller/CustomersController.php, line 4766]
Code Context

        $product_id = trim($this->request->getData("id"));
trim - [internal], line ??
App\Controller\CustomersController::addToCart() - APP/Controller/CustomersController.php, line 4766
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Routing\Middleware\RoutingMiddleware::process() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 161
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Routing\Middleware\AssetMiddleware::process() - CORE/src/Routing/Middleware/AssetMiddleware.php, line 68
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Error\Middleware\ErrorHandlerMiddleware::process() - CORE/src/Error/Middleware/ErrorHandlerMiddleware.php, line 126
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Runner::run() - CORE/src/Http/Runner.php, line 58
Cake\Http\Server::run() - CORE/src/Http/Server.php, line 90
[main] - ROOT/webroot/index.php, line 40