WC 3.4.0:CRITICAL Uncaught Error: Call to a member function is_type() on boolean

Hi there,

thanks for your reporting. You can fix the issue in this way:

1. Go in wp-content/plugins/yith-woocommerce-product-bundles and open the file class.yith-wcpb-admin.php

2. Go to line 22 and change it from

if ( ! $product->is_type( 'simple' ) ) {

to

if ( $product instanceof WC_Product && ! $product->is_type( 'simple' ) ) {

Another solution is to download a new copy of class.yith-wcpb-admin.php from here: https://we.tl/cQ142TKvIx and replace it in wp-content/plugins/yith-woocommerce-product-bundles

Let me know if this solve your issue.

@yithemes why not issue an updated version of the plugin for all the users to update and benefit from the fix?

Sure! We send an update very soon but I want to write it to you to have a fast fix.

@yithemes looking forward, thanks!

Hi,
this issue was fixed in version 1.1.7 (released: Jun 18, 2018) ??

When I push the Add To Cart button on Favorite Page, I get the message

Fatal error: Uncaught Error: Call to a member function is_type() on array in class.yith-wcwl-ui.php:200
Stack trace: #0 \wp-includes\class-wp-hook.php(286): YITH_WCWL_UI::alter_add_to_cart_button(‘apply_filters(‘<a href=”https:…’, Array) #2 \wp-content\themes\cleo\woocommerce\loop\add-to-cart.php(36): apply_filters(‘woocommerce_loo…’, ‘<a href=”https:…’, Array) #3 \wp-content\plugins\woocommerce\includes\wc-core-functions.php(210): include(‘C:\\OSPanel\\doma…’) #4 C:\OSPanel\domains\blablabla\wp-content\plugins\woocommerce\includes\wc-template-functions.php(1207): wc_get_template(‘loop/add-to-car…’, Array) #5 C:\OSPanel\domains\blablabla\wp-content\plugins\yith-woocommerce-wishlist\templates\wishlist-view.php(194): woocommerce_template_loop_add_to_cart() #6 C:\OSPanel\domains\blablabla\wp-co in C:\OSPanel\domains\blablabla\wp-content\plugins\yith-woocommerce-wishlist\includes\class.yith-wcwl-ui.php on line 200

Hi @sem1,
this issue is not due to YITH WooCommerce Product Bundles.
It’s related to YITH WooCommerce Wishlist, but it doesn’t seem be due to it: it could be caused to the fact your theme doesn’t use correctly the WooCommerce filter woocommerce_loop_add_to_cart_link; you should check in YOUR_THEME_FOLDER/woocommerce/loop/add-to-cart.php the second param of the apply filter is set to the global $product variable.

A further test you can make is the following:
Please, try to deactivate all plugins, leaving only WooCommerce, YITH WooCommerce Product Bundles and YITH WooCommerce Wishlist active, and see if the problem is solved. If so, try to activate them again, one by one, to see which one causes the issue.
If the problem isn’t caused by a plugin, try to activate the default theme Twenty Sixteen and see if you have the same issue.
Also, if you have customized some files in your theme, please try with a fresh installation without any customization.

Please try this solution and let us know what’s the result.

Please note: if this issue is not related with YITH WooCommerce Product Bundles, it would be better “moving” this thread in the YITH WooCommerce Wishlist support forum, to allow WordPress users to see it in the correct support forum page.

Best Regards

• This reply was modified 6 years, 6 months ago by YITHEMES.