magento 2.2 Warning: array_merge(): Argument #2 is not an array in vendor/magento/module-catalog/Helper/Product/Configuration.php on line 118

[wcldharamveer]

After upgrade magento 2.1.9 to 2.2.0, I have added a product with additional_options to cart. Product is added to cart successfully but when we go to cart page it is showing Exception Warning: array_merge(): Argument #2 is not an array in vendor/magento/module-catalog/Helper/Product/Configuration.php on line 118.

My Server Details:

1. magento Version 2.2.0
2. PHP 7
3. MYSQL 5.7.2

Error message is:
1 exception(s):
Exception #0 (Exception): Warning: array_merge(): Argument #2 is not an array in /var/www/html/motodirect/site/magento/vendor/magento/module-catalog/Helper/Product/Configuration.php on line 118

Exception #0 (Exception): Warning: array_merge(): Argument #2 is not an array in /var/www/html/motodirect/site/magento/vendor/magento/module-catalog/Helper/Product/Configuration.php on line 118
#0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'array_merge(): ...', '/var/www/html/m...', 118, Array)
#1 /var/www/html/motodirect/site/magento/vendor/magento/module-catalog/Helper/Product/Configuration.php(118): array_merge(Array, 'a:2:{i:0;a:2:{s...')
#2 /var/www/html/motodirect/site/magento/vendor/magento/module-catalog/Helper/Product/Configuration.php(132): Magento\Catalog\Helper\Product\Configuration->getCustomOptions(Object(Magento\Quote\Model\Quote\Item))
#3 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Catalog\Helper\Product\Configuration->getOptions(Object(Magento\Quote\Model\Quote\Item))
#4 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Catalog\Helper\Product\Configuration\Interceptor->___callParent('getOptions', Array)
#5 /var/www/html/motodirect/site/magento/vendor/magento/module-configurable-product/Helper/Product/Configuration/Plugin.php(32): Magento\Catalog\Helper\Product\Configuration\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Quote\Model\Quote\Item))
#6 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(135): Magento\ConfigurableProduct\Helper\Product\Configuration\Plugin->aroundGetOptions(Object(Magento\Catalog\Helper\Product\Configuration\Interceptor), Object(Closure), Object(Magento\Quote\Model\Quote\Item))
#7 /var/www/html/motodirect/site/magento/vendor/magento/module-grouped-product/Helper/Product/Configuration/Plugin/Grouped.php(54): Magento\Catalog\Helper\Product\Configuration\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Quote\Model\Quote\Item))
#8 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(135): Magento\GroupedProduct\Helper\Product\Configuration\Plugin\Grouped->aroundGetOptions(Object(Magento\Catalog\Helper\Product\Configuration\Interceptor), Object(Closure), Object(Magento\Quote\Model\Quote\Item))
#9 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Catalog\Helper\Product\Configuration\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Quote\Model\Quote\Item))
#10 /var/www/html/motodirect/site/magento/generated/code/Magento/Catalog/Helper/Product/Configuration/Interceptor.php(26): Magento\Catalog\Helper\Product\Configuration\Interceptor->___callPlugins('getOptions', Array, NULL)
#11 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Model/DefaultConfigProvider.php(404): Magento\Catalog\Helper\Product\Configuration\Interceptor->getOptions(Object(Magento\Quote\Model\Quote\Item))
#12 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Model/DefaultConfigProvider.php(385): Magento\Checkout\Model\DefaultConfigProvider->getFormattedOptionValue(Object(Magento\Quote\Model\Quote\Item))
#13 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Model/DefaultConfigProvider.php(257): Magento\Checkout\Model\DefaultConfigProvider->getQuoteItemData()
#14 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Checkout\Model\DefaultConfigProvider->getConfig()
#15 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Checkout\Model\DefaultConfigProvider\Interceptor->___callParent('getConfig', Array)
#16 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Checkout\Model\DefaultConfigProvider\Interceptor->Magento\Framework\Interception{closure}()
#17 /var/www/html/motodirect/site/magento/generated/code/Magento/Checkout/Model/DefaultConfigProvider/Interceptor.php(26): Magento\Checkout\Model\DefaultConfigProvider\Interceptor->___callPlugins('getConfig', Array, Array)
#18 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Model/CompositeConfigProvider.php(38): Magento\Checkout\Model\DefaultConfigProvider\Interceptor->getConfig()
#19 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Block/Cart/Shipping.php(64): Magento\Checkout\Model\CompositeConfigProvider->getConfig()
#20 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/Block/Cart/Shipping.php(97): Magento\Checkout\Block\Cart\Shipping->getCheckoutConfig()
#21 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/view/frontend/templates/cart/shipping.phtml(28): Magento\Checkout\Block\Cart\Shipping->getSerializedCheckoutConfig()
#22 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/TemplateEngine/Php.php(59): include('/var/www/html/m...')
#23 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/Template.php(270): Magento\Framework\View\TemplateEngine\Php->render(Object(Magento\Checkout\Block\Cart\Shipping), '/var/www/html/m...', Array)
#24 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/Template.php(300): Magento\Framework\View\Element\Template->fetchView('/var/www/html/m...')
#25 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/AbstractBlock.php(667): Magento\Framework\View\Element\Template->_toHtml()
#26 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(558): Magento\Framework\View\Element\AbstractBlock->toHtml()
#27 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(534): Magento\Framework\View\Layout->_renderBlock('checkout.cart.s...')
#28 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('checkout.cart.s...')
#29 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('checkout.cart.s...')
#30 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('cart.summary')
#31 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('cart.summary')
#32 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('cart.summary')
#33 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('checkout.cart.c...')
#34 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('checkout.cart.c...')
#35 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('checkout.cart.c...')
#36 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('checkout.cart.i...')
#37 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('checkout.cart.i...')
#38 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/AbstractBlock.php(507): Magento\Framework\View\Layout->renderElement('checkout.cart.i...', true)
#39 /var/www/html/motodirect/site/magento/vendor/magento/module-checkout/view/frontend/templates/cart.phtml(15): Magento\Framework\View\Element\AbstractBlock->getChildHtml('with-items')
#40 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/TemplateEngine/Php.php(59): include('/var/www/html/m...')
#41 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/Template.php(270): Magento\Framework\View\TemplateEngine\Php->render(Object(Magento\Checkout\Block\Cart), '/var/www/html/m...', Array)
#42 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/Template.php(300): Magento\Framework\View\Element\Template->fetchView('/var/www/html/m...')
#43 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Element/AbstractBlock.php(667): Magento\Framework\View\Element\Template->_toHtml()
#44 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(558): Magento\Framework\View\Element\AbstractBlock->toHtml()
#45 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(534): Magento\Framework\View\Layout->_renderBlock('checkout.cart')
#46 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('checkout.cart')
#47 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('checkout.cart')
#48 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('content')
#49 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('content')
#50 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('content')
#51 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('main')
#52 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('main')
#53 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('main')
#54 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('columns')
#55 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('columns')
#56 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('columns')
#57 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('main.content')
#58 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('main.content')
#59 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('main.content')
#60 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('page.wrapper')
#61 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('page.wrapper')
#62 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('page.wrapper')
#63 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(536): Magento\Framework\View\Layout->_renderContainer('root')
#64 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(489): Magento\Framework\View\Layout->renderNonCachedElement('root')
#65 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Layout.php(954): Magento\Framework\View\Layout->renderElement('root')
#66 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\Layout->getOutput()
#67 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\Layout\Interceptor->___callParent('getOutput', Array)
#68 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\Layout\Interceptor->Magento\Framework\Interception{closure}()
#69 /var/www/html/motodirect/site/magento/generated/code/Magento/Framework/View/Layout/Interceptor.php(39): Magento\Framework\View\Layout\Interceptor->___callPlugins('getOutput', Array, Array)
#70 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Result/Page.php(257): Magento\Framework\View\Layout\Interceptor->getOutput()
#71 /var/www/html/motodirect/site/magento/vendor/magento/framework/View/Result/Layout.php(170): Magento\Framework\View\Result\Page->render(Object(Magento\Framework\App\Response\Http\Interceptor))
#72 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\Result\Layout->renderResult(Object(Magento\Framework\App\Response\Http\Interceptor))
#73 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\Result\Page\Interceptor->___callParent('renderResult', Array)
#74 /var/www/html/motodirect/site/magento/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\Result\Page\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Framework\App\Response\Http\Interceptor))
#75 /var/www/html/motodirect/site/magento/generated/code/Magento/Framework/View/Result/Page/Interceptor.php(39): Magento\Framework\View\Result\Page\Interceptor->___callPlugins('renderResult', Array, Array)
#76 /var/www/html/motodirect/site/magento/vendor/magento/framework/App/Http.php(139): Magento\Framework\View\Result\Page\Interceptor->renderResult(Object(Magento\Framework\App\Response\Http\Interceptor))
#77 /var/www/html/motodirect/site/magento/vendor/magento/framework/App/Bootstrap.php(256): Magento\Framework\App\Http->launch()
#78 /var/www/html/motodirect/site/magento/pub/index.php(37): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#79 {main}

[wcldharamveer]

I have commented line number 118 $options = array_merge($options, $this->serializer->unserialize($addOptions->getValue())); in vendor/magento/module-catalog/Helper/Product/Configuration.php file. It is now showing cart items on cart page but the item additional options are not showing.
So kindly provide the best solution to fix it.

[orlangur]

Exception Warning: array_merge(): Argument #2 is not an array in vendor/magento/module-catalog/Helper/Product/Configuration.php on line 118.

So what is argument #2 in fact?

[vinayshah]

In line number 118 $options = array_merge($options, $this->serializer->unserialize($addOptions->getValue())); in vendor/magento/module-catalog/Helper/Product/Configuration.php file.

In the previous version i.e. 2.1.x the additional options used to using serialize and unserialize additional options. But in 2.2.x the serialize and unserialize functions are deprecated.

They have created a serializer class, in that they have written json_encode() and json_decode() function. So you would need to change the code from where you add additional options.

Hope this helps!

[wcldharamveer]

I have checked code and found that magento 2.2 is using Magento\Framework\Serialize\Serializer\Json class function serialize and unserialize. Here json_encode is using for serialize and json_decode is using for unserialize data.
I was used php function serialize and unserialize for additional options creation with cart items. it was working well with magento 2.1.x but not working with magento 2.2.x versions.
So now I have changed php serialize and unserialize functions by Magento\Framework\Serialize\Serializer\Json class function serialize and unserialize. It is working well now.

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

/* add following argument to construct*/
public function __construct(
Json $serializer = null
) {
$this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
}

public function execute() {
/* Other code here*/
/add additional option/
$additionalOptions = [];
$additionalOptions[] = array(
'label' => 'lable1',
'value' => 'value',
);

$product->addCustomOption('additional_options', $this->serializer->serialize($additionalOptions));

/* Other code here*/
}

[magento-engcom-team]

@wcldharamveer We are closing this ticket now, as it seems that you have solved the issue.

[orlangur]

@wcldharamveer it would be much faster to check 2.2 release notes instead of learning from code :) http://devdocs.magento.com/guides/v2.2/ext-best-practices/tutorials/serialized-to-json-data-upgrade.html