Title: Null pointer every other day Last modified: April 26, 2021 --- # Null pointer every other day * Resolved [saens](https://wordpress.org/support/users/saens/) * (@saens) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/) * Hi, Since the major refactoring of your plugin I’m getting a null-pointer every now and then. * ``` 2021-04-24T09:42:14+00:00 CRITICAL Uncaught Error: Call to a member function get_applied_coupons() on null in /home/deb/domains/domain.nl/public_html/wp-content/plugins/duracelltomi-google-tag-manager/integration/woocommerce.php:309 Stack trace: #0 /home/deb/domains/domain.nl/public_html/wp-includes/class-wp-hook.php(292): gtm4wp_woocommerce_datalayer_filter_items(Array) #1 /home/deb/domains/domain.nl/public_html/wp-includes/plugin.php(212): WP_Hook->apply_filters(Array, Array) #2 /home/deb/domains/domain.nl/public_html/wp-content/plugins/duracelltomi-google-tag-manager/public/frontend.php(676): apply_filters('gtm4wp_compile_...', Array) #3 /home/deb/domains/domain.nl/public_html/wp-includes/class-wp-hook.php(290): gtm4wp_wp_header_begin() #4 /home/deb/domains/domain.nl/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #5 /home/deb/domains/domain.nl/public_html/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #6 /home/deb/ in /home/deb/domains/domain.nl/public_html/wp-content/plugins/duracelltomi-google-tag-manager/integration/woocommerce.php op de lijn 309 ``` Viewing 7 replies - 1 through 7 (of 7 total) * Plugin Author [Thomas Geiger](https://wordpress.org/support/users/duracelltomi/) * (@duracelltomi) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364025) * Hi, * Thanks for the report. I’ve added some extra checks that should fix this: [https://github.com/duracelltomi/gtm4wp/commit/06e13323a87c6d7e0d54b1d83962581f30c0165a](https://github.com/duracelltomi/gtm4wp/commit/06e13323a87c6d7e0d54b1d83962581f30c0165a) * If you can test this on your dev site, I would be grateful for any feedback. If you can not patch your live instance, you can disable “Cart content in data layer” option under Integration -> WooCommerce if you do not need this specific feature for any reason (it is not related to ecommerce tracking) * Thread Starter [saens](https://wordpress.org/support/users/saens/) * (@saens) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364046) * I would test, but I don’t know how to trigger it. It just shows in my logs every now and then. Can’t track it to a real user interacting with the site either, so maybe some bot does something. * Plugin Author [Thomas Geiger](https://wordpress.org/support/users/duracelltomi/) * (@duracelltomi) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364065) * Perhaps it is related to the CLI version of WooCommerce where one can interact with WooCommerce via API calls. * Do you have any admin user who might use an external tool to manage WooCommerce related tasks? * Thread Starter [saens](https://wordpress.org/support/users/saens/) * (@saens) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364085) * There’s no access afaik other than wp-admin. XML-RPC is blocked as well. * Plugin Author [Thomas Geiger](https://wordpress.org/support/users/duracelltomi/) * (@duracelltomi) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364098) * In that case I do not know how this happens 🙁 * The patch will go live in the next plugin version (~2-3 weeks from now). Until then, if you see no risk, you can apply the changes on your site and check your logs. * Thread Starter [saens](https://wordpress.org/support/users/saens/) * (@saens) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14364255) * Been digging through the server logs (instead of google analytics). Found someone doing some stuff: * [https://mydomain.nl/wp-content/uploads/https://mydomain.nl/wp-json/](https://mydomain.nl/wp-content/uploads/https://mydomain.nl/wp-json/) * Calling this myself in browser resulted in the error. After applying the patch it no longer shows the error. * Thanks! * [r1baum](https://wordpress.org/support/users/r1baum/) * (@r1baum) * [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14372039) * Hi, * i had the same error in our error_logs today. What i see is that some kind of bot tried different urls and added ‘/wp-json/wp/v2/users/’ to the links. Which all resulted in the error above mentioned. Did some testing and adding /wp-json/ to an existing link is enough. e.g. [https://mysite.com/category/wp-json/](https://mysite.com/category/wp-json/)- > 500 … * Hope this helps. * Best! Viewing 7 replies - 1 through 7 (of 7 total) The topic ‘Null pointer every other day’ is closed to new replies. * ![](https://ps.w.org/duracelltomi-google-tag-manager/assets/icon-256x256.png? rev=1708451) * [GTM4WP - A Google Tag Manager (GTM) plugin for WordPress](https://wordpress.org/plugins/duracelltomi-google-tag-manager/) * [Frequently Asked Questions](https://wordpress.org/plugins/duracelltomi-google-tag-manager/#faq) * [Support Threads](https://wordpress.org/support/plugin/duracelltomi-google-tag-manager/) * [Active Topics](https://wordpress.org/support/plugin/duracelltomi-google-tag-manager/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/duracelltomi-google-tag-manager/unresolved/) * [Reviews](https://wordpress.org/support/plugin/duracelltomi-google-tag-manager/reviews/) * 7 replies * 3 participants * Last reply from: [r1baum](https://wordpress.org/support/users/r1baum/) * Last activity: [5 years, 1 month ago](https://wordpress.org/support/topic/null-pointer-every-other-day/#post-14372039) * Status: resolved