Magento 2.2 fix Home Page error if store view is not defined

[selusi]

Preconditions

1. PHP 7.0.2
2. Ubuntu 17.4
3. Apache 2.4
4. MySql 5.7

Steps to reproduce

1. Create and enable at least 2 store views in Stores->All Stores.
2. In Stores->Configuration->General->Web set Add Store Code to Urls = Yes
3. Delete all cookie from browser
4. Go to Home Page of your store

Expected result

1. View the home page of default store view

Actual result

1 exception(s):
Exception #0 (Magento\Framework\Exception\NoSuchEntityException): Requested store is not found

Exception #0 (Magento\Framework\Exception\NoSuchEntityException): Requested store is not found
#0 /var/www/html/magento-220/vendor/magento/module-store/Model/StoreManager.php(168): Magento\Store\Model\StoreRepository->get('')
#1 /var/www/html/magento-220/generated/code/Magento/Store/Model/StoreManagerInterface/Proxy.php(119): Magento\Store\Model\StoreManager->getStore('')
#2 /var/www/html/magento-220/vendor/magento/module-store/Model/Resolver/Store.php(29): Magento\Store\Model\StoreManagerInterface\Proxy->getStore(NULL)
#3 /var/www/html/magento-220/vendor/magento/framework/App/Config/ScopeCodeResolver.php(49): Magento\Store\Model\Resolver\Store->getScope(NULL)
#4 /var/www/html/magento-220/vendor/magento/framework/App/Config.php(69): Magento\Framework\App\Config\ScopeCodeResolver->resolve('stores', NULL)
#5 /var/www/html/magento-220/vendor/magento/framework/View/DesignExceptions.php(76): Magento\Framework\App\Config->getValue('design/theme/ua...', 'stores')
#6 /var/www/html/magento-220/vendor/magento/module-page-cache/Model/App/CacheIdentifierPlugin.php(43): Magento\Framework\View\DesignExceptions->getThemeByRequest(Object(Magento\Framework\App\Request\Http))
#7 /var/www/html/magento-220/vendor/magento/framework/Interception/Interceptor.php(146): Magento\PageCache\Model\App\CacheIdentifierPlugin->afterGetValue(Object(Magento\Framework\App\PageCache\Identifier\Interceptor), '40befc535c47bc2...')
#8 /var/www/html/magento-220/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\PageCache\Identifier\Interceptor->Magento\Framework\Interception\{closure}()
#9 /var/www/html/magento-220/generated/code/Magento/Framework/App/PageCache/Identifier/Interceptor.php(26): Magento\Framework\App\PageCache\Identifier\Interceptor->___callPlugins('getValue', Array, Array)
#10 /var/www/html/magento-220/vendor/magento/framework/App/PageCache/Kernel.php(115): Magento\Framework\App\PageCache\Identifier\Interceptor->getValue()
#11 /var/www/html/magento-220/vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(71): Magento\Framework\App\PageCache\Kernel->load()
#12 /var/www/html/magento-220/vendor/magento/framework/Interception/Interceptor.php(135): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#13 /var/www/html/magento-220/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#14 /var/www/html/magento-220/generated/code/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#15 /var/www/html/magento-220/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#16 /var/www/html/magento-220/vendor/magento/framework/App/Bootstrap.php(256): Magento\Framework\App\Http->launch()
#17 /var/www/html/magento-220/index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#18 {main}

To fix the issue

Must change the method getStore() in Magento\Store\Model\StoreManager.
To avoid home page error in frontend. If $storeId is not defined: It retrive data from COOKIE first, otherwise return the default store code.
At line 164 add the below patch:

		if(!$storeId){
			if(isset($_COOKIE['store']) && $_COOKIE['store'] !== ''){
				$storeId = $_COOKIE['store'];
			} else {
				$storeId = $this->getDefaultStoreView()->getCode();
			}			
		}

[orlangur]

Patch does not look good to me. On line 168 $storeId must already have a valid value.

Obtaining default store code logic is placed in $this->currentStoreId = $this->storeResolver->getCurrentStoreId();.

[selusi]

@orlangur You have right .
A better solution is to change 155 line of Magento\Store\Model\StoreManager:

from

if (null === $this->currentStoreId) {

to (solution 1)

if (null === $this->currentStoreId || '' === $this->currentStoreId) {

or shortest (solution 2 as in Magento 2.1.9 version)

if (!$this->currentStoreId) {

This works well for me, though there has to be a reason why this line has been modified in Magento 2.2.0 version, but I still do not understand why. Probably because the 'store_id' of the administration panel is '0', in this case solution 1 should be better.

Sicurly the null value of $this->currentStoreId has a sense on reinitStores() method but there must be another point where the variable $this -> currentStoreId is initialized to an empty value.

[magento-engcom-team]

@selusi, thank you for your report.
We've created internal ticket(s) MAGETWO-82103 to track progress on the issue.

[sbaixauli]

I am working on it at #mm17es