Title: Plugin install, fatal error, database Last modified: April 24, 2022 --- # Plugin install, fatal error, database * Resolved [AndiBo](https://wordpress.org/support/users/andibo/) * (@andibo) * [4 years, 1 month ago](https://wordpress.org/support/topic/plugin-install-fatal-error-database/) * Hi, I have a problem with the activation of the plugin. I can not activate it, I get an error message. * On a fresh WordPress installation I can activate the plugin without any problems but I would like to try the plugin on my existing site and not set up everything from scratch. * Before Plugins Install: [https://dev.not-idea.de/wp-content/uploads/1.jpg](https://dev.not-idea.de/wp-content/uploads/1.jpg) * After Plugin Install: [https://dev.not-idea.de/wp-content/uploads/2.jpg](https://dev.not-idea.de/wp-content/uploads/2.jpg) * ``` Warning: Undefined property: WP_Post_Type::$custom_rewrite in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 181 Warning: Undefined property: WP_Post_Type::$custom_query_var in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 183 Warning: Undefined property: WP_Post_Type::$custom_rewrite in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 181 Warning: Undefined property: WP_Post_Type::$custom_query_var in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 183 Warning: Undefined property: WP_Post_Type::$custom_rewrite in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 181 Warning: Undefined property: WP_Post_Type::$custom_query_var in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 183 Warning: Undefined property: WP_Post_Type::$custom_rewrite in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 181 Warning: Undefined property: WP_Post_Type::$custom_query_var in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 183 Warning: Undefined property: WP_Post_Type::$custom_rewrite in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 181 Warning: Undefined property: WP_Post_Type::$custom_query_var in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 183 Warning: Undefined array key 0 in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 227 ``` * `Fatal error: Uncaught Error: Call to a member function getId() on null in /var/ www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/ acpt-lite/src/Includes/ACPT_Lite_DB.php:229 Stack trace: #0 /var/www/vhosts/hosting134183. a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/plugins/acpt-lite/src/Includes/ ACPT_Lite_DB.php(106): ACPT_Lite\Includes\ACPT_Lite_DB::createNativeTaxonomies()# 1 /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not-idea/dev/wp-content/ plugins/acpt-lite/advanced-custom-post-type-lite.php(82): ACPT_Lite\Includes\ ACPT_Lite_DB::sync() #2 /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/ not-idea/dev/wp-content/plugins/acpt-lite/advanced-custom-post-type-lite.php( 92): ACPT_Lite::checkForPluginUpgrades() #3 /var/www/vhosts/hosting134183.a2e34. netcup.net/httpdocs/not-idea/dev/wp-admin/includes/plugin.php(2288): include_once('/ var/www/vhosts...') #4 /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/ not-idea/dev/wp-admin/plugins.php(192): plugin_sandbox_scrape('acpt-lite/advan...')# 5 {main} thrown in /var/www/vhosts/hosting134183.a2e34.netcup.net/httpdocs/not- idea/dev/wp-content/plugins/acpt-lite/src/Includes/ACPT_Lite_DB.php on line 229` * Best Regards Andibo Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Author [mauretto1978](https://wordpress.org/support/users/mauretto1978/) * (@mauretto1978) * [4 years, 1 month ago](https://wordpress.org/support/topic/plugin-install-fatal-error-database/#post-15587735) * Hi Andibo, and thank you so much for reporting this issue. * The errors seem to be in the sync process. I don’t know why this happens but I can introduce a conditional statement in this part of the code to avoid the error. * Anyway, you can reach me at [info@acpt.io](https://wordpress.org/support/topic/plugin-install-fatal-error-database/info@acpt.io?output_format=md) in order to provide me more details to replicate the bug on my end. * Thank you in advance! * Mauro * Plugin Author [mauretto1978](https://wordpress.org/support/users/mauretto1978/) * (@mauretto1978) * [4 years, 1 month ago](https://wordpress.org/support/topic/plugin-install-fatal-error-database/#post-15593116) * The errors shown refer to a PHP8 incompatibility, there was a breaking change in `call_user_func_array` function. * **At the present time (2022-04-26) the plugin is not tested yet on PHP8**. * I’ll try to release the patch as soon as possible, then the topic will be updated and closed 🙂 * Thread Starter [AndiBo](https://wordpress.org/support/users/andibo/) * (@andibo) * [4 years, 1 month ago](https://wordpress.org/support/topic/plugin-install-fatal-error-database/#post-15593302) * Thanks a lot for your time, with your help the plugin works now on my website! * Best Regards Andi Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘Plugin install, fatal error, database’ is closed to new replies. * ![](https://ps.w.org/acpt-lite/assets/icon-256x256.png?rev=3231354) * [Custom post types for Wordpress – ACPT Lite](https://wordpress.org/plugins/acpt-lite/) * [Frequently Asked Questions](https://wordpress.org/plugins/acpt-lite/#faq) * [Support Threads](https://wordpress.org/support/plugin/acpt-lite/) * [Active Topics](https://wordpress.org/support/plugin/acpt-lite/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/acpt-lite/unresolved/) * [Reviews](https://wordpress.org/support/plugin/acpt-lite/reviews/) * 3 replies * 2 participants * Last reply from: [AndiBo](https://wordpress.org/support/users/andibo/) * Last activity: [4 years, 1 month ago](https://wordpress.org/support/topic/plugin-install-fatal-error-database/#post-15593302) * Status: resolved