Title: Fatal error when moving attendees Last modified: May 21, 2026 --- # Fatal error when moving attendees * Resolved [code3creative](https://wordpress.org/support/users/code3creative/) * (@code3creative) * [2 weeks, 3 days ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/) * This site is experiencing a fatal error when trying to move attendees. Looks like someone else also created a thread about this same issue. I replaced the actual domain with “example.com” for privacy – but the error shows you the problem: * Error Details * An error of type E_ERROR was caused in line 120 of the file /home/customer/www/ example.com/public_html/wp-content/plugins/event-tickets/common/vendor/vendor- prefixed/stellarwp/harbor/src/Harbor/Admin/Feature_Manager_Page.php. * Error message: Uncaught TypeError: TEC\Common\LiquidWeb\Harbor\Admin\Feature_Manager_Page:: maybe_enqueue_assets(): Argument #1 ($hook_suffix) must be of type string, null given, called in /home/customer/www/example.com/public_html/wp-includes/class- wp-hook.php on line 341 and defined in /home/customer/www/example.com/public_html/ wp-content/plugins/event-tickets/common/vendor/vendor-prefixed/stellarwp/harbor/ src/Harbor/Admin/Feature_Manager_Page.php:120 * Stack trace: 0 /home/customer/www/example.com/public_html/wp-includes/class-wp- hook.php(341): TEC\Common\LiquidWeb\Harbor\Admin\Feature_Manager_Page->maybe_enqueue_assets( NULL) 1 /home/customer/www/example.com/public_html/wp-includes/class-wp-hook. php(365): WP_Hook->apply_filters(NULL, Array) 2 /home/customer/www/example.com/ public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) 3 /home/customer/ www/example.com/public_html/wp-admin/includes/template.php(2154): do_action(‘ admin_enqueue_s…’, NULL) 4 /home/customer/www/example.com/public_html/wp-content/ plugins/event-tickets/src/Tribe/Admin/Move_Tickets.php(96): iframe_header(‘Move Attendees’) 5 /home/customer/www/example.com/public_html/wp-includes/class-wp- hook.php(341): Tribe__Tickets__Admin__Move_Tickets->dialog(”) 6 /home/customer/ www/example.com/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters( NULL, Array) 7 /home/customer/www/example.com/public_html/wp-includes/plugin. php(522): WP_Hook->do_action(Array) 8 /home/customer/www/example.com/public_html/ wp-admin/admin.php(180): do_action(‘admin_init’) 9 /home/customer/www/example. com/public_html/wp-admin/edit.php(10): require_once(‘/home/customer/…’) 10 {main} * thrown Viewing 7 replies - 1 through 7 (of 7 total) * [phxadm](https://wordpress.org/support/users/phxadm/) * (@phxadm) * [2 weeks, 3 days ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18914985) * So I am having the same issue, I was able to fix it by adding a question mark before the word string in line 120 of the code on my backend. Basically followed the menu all the way down until I got to the correct php code. * Started at the content/ and went all the way down until I found the code to correct. * An error of type E_ERROR was caused in line 120 of the file /home/customer/www/ example.com/public_html/wp-content/plugins/event-tickets/common/vendor/vendor- prefixed/stellarwp/harbor/src/Harbor/Admin/Feature_Manager_Page.php. * It is not a perfect fix as I am unsure what caused it but my team did let me know it is working well currently * Plugin Author [Dimitris Pantazis](https://wordpress.org/support/users/dpantazis/) * (@dpantazis) * [2 weeks, 3 days ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18915004) * Hello [@code3creative](https://wordpress.org/support/users/code3creative/) and [@phxadm](https://wordpress.org/support/users/phxadm/), Thank you for the report. We have become aware of that issue and we will be including the fix in our next release. For now, [here](https://github.com/stellarwp/harbor/pull/164) is how we are fixing in case you are confident enough to implement the fix yourselves. Thank you! * Thread Starter [code3creative](https://wordpress.org/support/users/code3creative/) * (@code3creative) * [2 weeks, 2 days ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18915604) * Ok I went ahead and did the change from the github. I am going to have the client try what caused the fatal error last time in the morning – can we keep this thread open until I reply with their update? * Thread Starter [code3creative](https://wordpress.org/support/users/code3creative/) * (@code3creative) * [1 week, 1 day ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18923508) * I have updated to the latest version of the plugin and I am getting this fatal error now (example.com is replacing my URL for privacy) * Error Details * An error of type E_ERROR was caused in line 135 of the file /home/customer/www/ example.com/public_html/wp-content/plugins/event-tickets/common/src/Common/Integrations/ Harbor/PUE.php. Error message: Uncaught TypeError: TEC\Common\Integrations\Harbor\ PUE::filter_pre_http_request(): Argument #3 ($url) must be of type string, null given, called in /home/customer/www/example.com/public_html/wp-includes/class- wp-hook.php on line 341 and defined in /home/customer/www/example.com/public_html/ wp-content/plugins/event-tickets/common/src/Common/Integrations/Harbor/PUE.php: 135 * Stack trace: 0 /home/customer/www/example.com/public_html/wp-includes/class-wp- hook.php(341): TEC\Common\Integrations\Harbor\PUE->filter_pre_http_request(false, Array, NULL) 1 /home/customer/www/example.com/public_html/wp-includes/plugin. php(205): WP_Hook->apply_filters(false, Array) 2 /home/customer/www/example.com/ public_html/wp-includes/class-wp-http.php(277): apply_filters(‘pre_http_reques…’, false, Array, NULL) 3 /home/customer/www/example.com/public_html/wp-includes/ class-wp-http.php(657): WP_Http->request(NULL, Array) 4 /home/customer/www/example. com/public_html/wp-includes/http.php(189): WP_Http->get(NULL, Array) 5 /home/ customer/www/example.com/public_html/wp-content/plugins/sg-cachepress/core/File_Cacher/ File_Cacher.php(764): wp_remote_get(NULL, Array) 6 /home/customer/www/example. com/public_html/wp-content/plugins/sg-cachepress/core/File_Cacher/File_Cacher. php(540): SiteGround_Optimizer\File_Cacher\File_Cacher->hit_url_cache(NULL) 7/ home/customer/www/example.com/public_html/wp-content/plugins/sg-cachepress/core/ Supercacher/Supercacher.php(219): SiteGround_Optimizer\File_Cacher\File_Cacher:: purge_cache_request(NULL, true) 8 /home/customer/www/example.com/public_html/ wp-content/plugins/sg-cachepress/core/Supercacher/Supercacher.php(492): SiteGround_Optimizer\ Supercacher\Supercacher::purge_cache_request(NULL, true) 9 /home/customer/www/ example.com/public_html/wp-includes/class-wp-hook.php(343): SiteGround_Optimizer\ Supercacher\Supercacher->purge_queue(109680) 10 /home/customer/www/example.com/ public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) 11 /home/customer/www/example.com/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) 12 /home/customer/www/example.com/public_html/wp-includes/ post.php(5193): do_action(‘save_post’, 109680, Object(WP_Post), true) 13 /home/ customer/www/example.com/public_html/wp-includes/post.php(5295): wp_insert_post( Array, false, true) 14 /home/customer/www/example.com/public_html/wp-admin/includes/ post.php(449): wp_update_post(Array) 15 /home/customer/www/example.com/public_html/ wp-admin/post.php(227): edit_post() 16 {main} * thrown * Thread Starter [code3creative](https://wordpress.org/support/users/code3creative/) * (@code3creative) * [6 days, 3 hours ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18925546) * Still getting this fatal error on the website. Got another email notification about it today. Looks like others are also posting support threads here with the same problem. Can we please get a fix? * Plugin Support [Darian](https://wordpress.org/support/users/d0153/) * (@d0153) * [3 days, 8 hours ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18928686) * Hi [@code3creative](https://wordpress.org/support/users/code3creative/) * Thanks for your message. It looks like this is a different error from the one you initially reported. * Could you please go to **WP Admin → SG Optimizer → Caching → File-Based Caching** and turn it OFF, then check if that resolves the issue? * In the meantime, I’ve already shared the error message with our team for further investigation, and we’ll update you as soon as we have more information. * Thread Starter [code3creative](https://wordpress.org/support/users/code3creative/) * (@code3creative) * [23 hours, 8 minutes ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18930825) * It looks like the latest plugin update may have fixed the issue. I’ll mark this resolved for now, but will reopen if it happens again. Thanks! Viewing 7 replies - 1 through 7 (of 7 total) You must be [logged in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-when-moving-attendees%2F%3Foutput_format%3Dmd&locale=en_US) to reply to this topic. * ![](https://ps.w.org/event-tickets/assets/icon.svg?rev=2259340) * [Event Tickets and Registration](https://wordpress.org/plugins/event-tickets/) * [Frequently Asked Questions](https://wordpress.org/plugins/event-tickets/#faq) * [Support Threads](https://wordpress.org/support/plugin/event-tickets/) * [Active Topics](https://wordpress.org/support/plugin/event-tickets/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/event-tickets/unresolved/) * [Reviews](https://wordpress.org/support/plugin/event-tickets/reviews/) * 7 replies * 4 participants * Last reply from: [code3creative](https://wordpress.org/support/users/code3creative/) * Last activity: [23 hours, 8 minutes ago](https://wordpress.org/support/topic/fatal-error-when-moving-attendees/#post-18930825) * Status: resolved