Issues during Shop Checkout

Hi there,

I am having some intermittent issues with the Microweber shop, where some orders do not get transferred to the Payment Gateway (PayPal).

The order gets created, and the shopping cart gets emptied, and they get taken back to the checkout page with "your cart is empty".

The only errors that I can see are as follows, at the same time as checkout:

[2016-02-26 13:12:52] production.ERROR: exception 'ErrorException' with message 'Array to string conversion' in /home/public_html/src/Microweber/Utils/Format.php:39
Stack trace:
#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, 'Array to string...', '/home/aioda/pub...', 39, Array)
#1 /home/aioda/public_html/src/Microweber/Utils/Format.php(39): implode(', ', Array)
#2 /home/aioda/public_html/src/Microweber/Utils/Format.php(32): Microweber\Utils\Format->array_to_ul(Array)
#3 /home/aioda/public_html/src/Microweber/Providers/ShopManager.php(398): Microweber\Utils\Format->array_to_ul(Array)
#4 /home/aioda/public_html/src/Microweber/Providers/ShopManager.php(840): Microweber\Providers\ShopManager->confirm_email_send(9)
#5 /home/aioda/public_html/src/Microweber/Providers/ShopManager.php(365): Microweber\Providers\ShopManager->after_checkout(9)
#6 /home/aioda/public_html/src/Microweber/Providers/ShopManager.php(306): Microweber\Providers\ShopManager->place_order(Array)
#7 /home/aioda/public_html/src/Microweber/functions/shop.php(89): Microweber\Providers\ShopManager->checkout(Array)
#8 /home/aioda/public_html/src/Microweber/Controllers/DefaultController.php(504): checkout(Array)
#9 [internal function]: Microweber\Controllers\DefaultController->api('checkout')
#10 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(246): call_user_func_array(Array, Array)
#11 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(162): Illuminate\Routing\Controller->callAction('api', Array)
#12 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(107): Illuminate\Routing\ControllerDispatcher->call(Object(Microweber\Controllers\DefaultController), Object(Illuminate\Routing\Route), 'api')
#13 [internal function]: Illuminate\Routing\ControllerDispatcher->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#14 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#15 [internal function]: Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#16 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(101): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#17 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(108): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#18 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(67): Illuminate\Routing\ControllerDispatcher->callWithinStack(Object(Microweber\Controllers\DefaultController), Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request), 'api')
#19 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(204): Illuminate\Routing\ControllerDispatcher->dispatch(Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request), '\\Microweber\\Con...', 'api')
#20 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(134): Illuminate\Routing\Route->runWithCustomDispatcher(Object(Illuminate\Http\Request))
#21 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(701): Illuminate\Routing\Route->run(Object(Illuminate\Http\Request))
#22 [internal function]: Illuminate\Routing\Router->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#23 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#24 [internal function]: Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#25 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(101): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#26 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(703): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#27 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(670): Illuminate\Routing\Router->runRouteWithinStack(Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request))
#28 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(628): Illuminate\Routing\Router->dispatchToRoute(Object(Illuminate\Http\Request))
#29 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(214): Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request))
#30 [internal function]: Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}(Object(Illuminate\Http\Request))
#31 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#32 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(55): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#33 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(125): Illuminate\View\Middleware\ShareErrorsFromSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#34 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(61): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#35 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(125): Illuminate\Session\Middleware\StartSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#36 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(36): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#37 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(125): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle(Object(Illuminate\Http\Request), Object(Closure))
#38 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(40): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#39 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(125): Illuminate\Cookie\Middleware\EncryptCookies->handle(Object(Illuminate\Http\Request), Object(Closure))
#40 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(42): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#41 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(125): Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode->handle(Object(Illuminate\Http\Request), Object(Closure))
#42 [internal function]: Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#43 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(101): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#44 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(115): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#45 /home/aioda/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(84): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter(Object(Illuminate\Http\Request))
#46 /home/aioda/public_html/index.php(70): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
#47 {main}