{"id":19017477,"date":"2026-09-11T09:39:04","date_gmt":"2026-09-11T09:39:04","guid":{"rendered":"https:\/\/wordpress.org\/support\/?post_type=topic&#038;p=19017477"},"modified":"2026-09-11T09:57:36","modified_gmt":"2026-09-11T09:57:36","slug":"bug-is_checkout-function-error-2","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/bug-is_checkout-function-error-2\/","title":{"rendered":"Bug: is_checkout() function error"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Dear Support,<br \/><br \/>We are experiencing an intermittent issue on our website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On September 9, 2026, the \/feed\/ URL returned a 500 error with the following message:<br \/>Call to undefined function PaymentPlugins\\Stripe\\is_checkout()<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">My hosting provider confirmed that the is_checkout() function exists in WooCommerce 11.1.0, but it was not available during the affected request. They also found several other WooCommerce file-loading errors in the server logs around the same period, including an instance where a required WooCommerce file could not be loaded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Could you please investigate whether this is an issue that can be addressed on your end, or advise if there is anything I should check on my side to help prevent it from happening again?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The error appears to occur intermittently and is not present on every request, based on the server logs.<br \/>WooCommerce: 11.1.0<br \/>WooCommerce Stripe Payment: 4.0.13<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We posted this support request in the WooCommerce forum but were requested to post it again here:<br \/><a href=\"https:\/\/wordpress.org\/support\/topic\/bug-is_checkout-function-error\/\">https:\/\/wordpress.org\/support\/topic\/bug-is_checkout-function-error\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many thanks for your help with this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Piet<\/p>\n","protected":false},"template":"","class_list":["post-19017477","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19017477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19017477\/revisions"}],"predecessor-version":[{"id":19017496,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19017477\/revisions\/19017496"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=19017477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}