Fatal Error calling is_main_query()

[bekarice]

From zd-ticket-555210:

Fatal error: Uncaught Error: Call to a member function is_main_query() on null in /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-includes/query.php:749 
Stack trace: #0 /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-content/plugins/woocommerce-gateway-paypal-express-checkout/includes/class-wc-gateway-ppec-checkout-handler.php(73): is_main_query() 
#1 /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-includes/class-wp-hook.php(300): WC_Gateway_PPEC_Checkout_Handler->endpoint_page_titles('') 
#2 /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-includes/plugin.php(203): WP_Hook->apply_filters('', Array) 
#3 /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-includes/post-template.php(158): apply_filters('the_title', '', 10882) 
#4 /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-content/plugins/woocommerce-pdf-product-vouchers/includes/customizer/class-wc-pdf-product-vouchers-customizer.php(603): ge in /homepages/10/d444022076/htdocs/clickandbuilds/WordPress/vitadrom15/wp-includes/query.php on line 749

Looks like perhaps this needs an if ( ! is_admin() ) check?

[vijayhardaha]

Having this same issue again.

CRITICAL Uncaught Error: Call to a member function is_main_query() on null in /home/customer/www/XXXXXXXX/public_html/wp-includes/query.php:915
Stack trace:
#0 /home/customer/www/XXXXXXXX/public_html/wp-content/plugins/woocommerce-gateway-paypal-express-checkout/includes/class-wc-gateway-ppec-checkout-handler.php(76): is_main_query()
#1 /home/customer/www/XXXXXXXX/public_html/wp-includes/class-wp-hook.php(294): WC_Gateway_PPEC_Checkout_Handler->endpoint_page_titles('Collected')
#2 /home/customer/www/XXXXXXXX/public_html/wp-includes/plugin.php(212): WP_Hook->apply_filters('Collected', Array)
#3 /home/customer/www/XXXXXXXX/public_html/wp-includes/post-template.php(171): apply_filters('the_title', 'Collected', 524389)
#4 /home/customer/www/XXXXXXXX/public_html/wp-content/plugins/yith-woocommerce-custom-order-status-premium/includes/class.yith-wccos-admin.php(310): get_the_title(Object(WP_Post))
#5 /home/customer/www/XXXXXXXX/public_html/wp-includes/class-wp-hook.php(292): YITH_WCCOS_Admin->get_custom_statuses(Arra in /home/customer/www/XXXXXXXX/public_html/wp-includes/query.php on line 915

But it's only happened with the custom status Collected or id 524389

what could be reason?

[nhadsall]

We are getting the same error due to an activity log plugin calling get_the_title( $postID );

Stack trace:
#0 /home/user/public_html/wp-content/plugins/woocommerce-gateway-paypal-express-checkout/includes/class-wc-gateway-ppec-checkout-handler.php(76): is_main_query()
#1 /home/user/public_html/wp-includes/class-wp-hook.php(309): WC_Gateway_PPEC_Checkout_Handler->endpoint_page_titles('Private: Unlock...')
#2 /home/user/public_html/wp-includes/plugin.php(189): WP_Hook->apply_filters('Private: Unlock...', Array)
#3 /home/user/public_html/wp-includes/post-template.php(171): apply_filters('the_title', 'Private: Unlock...', 617344)
#4 /home/user/public_html/wp-content/plugins/aryo-activity-log/hooks/class-aal-hook-posts.php(7): get_the_title(Object(WP_Post))
#5 /home/user/public_html/wp-content/plugins/aryo-activity-log/hooks/class-aal-hook-posts.php(45): AAL_Hook_Posts->_draft_or_post_title(617344)
#6 /home/user/public_html/wp-includes/class-wp-hook.php(307): AAL_Hook_Posts->hooks_transition_post_s in /home/user/public_html/wp-includes/query.php on line 919