wpsnoop Fatal error: Cannot redeclare acf_duplicate_fields()

If you are dealing with a WordPress issue where a PHP Function acf_duplicate_fields() was already declared it is most likely due to a plugin/theme conflict.

wpsnoop scanned and analyzed over 100,000 WordPress plugins and themes to find and locate potential conflicts including functions that share the same name.

This page has information on the 45 places where that function is declared and used in WordPress plugins and themes.

Note: Our database currently only taps into the free themes and plugins available in the publicly available WordPress plugins and themes, if your site uses paid plugins, themes or custom code there may be additional conflicts.


Our database has uncovered 45 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/swp-contact-form-7-analytics/acf/api/api-field.php:1314)

This file is part of the WordPress plugin Contact Form 7 Analytics and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/tweetboost/assets/plugins/acf/includes/api/api-field.php:1364)

This file is part of the WordPress plugin TweetBoost Free - Simple Tweet Scheduler For WordPress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/woordle/vendors/advanced-custom-fields/includes/acf-field-functions.php:1347)

This file is part of the WordPress plugin Woordle and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/dp-intro-tours/vendor/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Intro Tour Tutorial and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/mapifylite/lib/advanced-custom-fields/includes/acf-field-functions.php:1375)

This file is part of the WordPress plugin MapifyLite and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/mihdan-yandex-turbo-feed/vendor/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Mihdan: Yandex Turbo Feed and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/intellipush/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Intellipush and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/post-to-captorra/lib/advanced-custom-fields/includes/acf-field-functions.php:1385)

This file is part of the WordPress plugin Post to Captorra and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/work-time-allocator/lib/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Work Time Allocator and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wp-dev-powers-acf-color-coded-field-types/acf/advanced-custom-fields/includes/acf-field-functions.php:1347)

This file is part of the WordPress plugin WordPress Dev Powers - ACF Color Coded Field Types Plugin and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/stockunlocks/includes/lib/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin StockUnlocks and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/snappy-list-builder/lib/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Snappy List Builder and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/lemm-toolbar/vendor/advanced-custom-fields-pro/includes/api/api-field.php:1418)

This file is part of the WordPress plugin Lemm Toolbar and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/repeat-events/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Repeat Events and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/mapster-wp-maps/includes/acf/includes/acf-field-functions.php:1385)

This file is part of the WordPress plugin Mapster WP Maps and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/cta/shared/assets/plugins/advanced-custom-fields/includes/api/api-field.php:1418)

This file is part of the WordPress plugin Calls to Action and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/social-influencer-links/lib/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Social Influencer Links and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/asciinema-player/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Asciinema Player and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/extensions-for-elementor/includes/custom-fields/includes/acf-field-functions.php:1385)

This file is part of the WordPress plugin Extensions For Elementor and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wa-chat-for-wp/vendor/advanced-custom-fields-pro/includes/acf-field-functions.php:1354)

This file is part of the WordPress plugin WhatsApp Chat for WordPress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/navthemes-employee-ratings/admin/includes/api/api-field.php:1418)

This file is part of the WordPress plugin NavThemes Employee Ratings and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/90-in-90/inc/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin 90 in 90 and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/simple-inventory-and-sales/vendor/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Simple Inventory and Sales and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/navthemes-landing-pages/admin/includes/api/api-field.php:1418)

This file is part of the WordPress plugin NavThemes Landing Pages and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wp-openagenda/3rd-party/acf/includes/acf-field-functions.php:1353)

This file is part of the WordPress plugin WP Openagenda and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/frontend-admin/includes/acf/includes/acf-field-functions.php:1385)

This file is part of the WordPress plugin Frontend Admin and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/beebee-mini/bee-admin/admin/library/framework/includes/acf-field-functions.php:1375)

This file is part of the WordPress plugin Beebee Mini 比比小程序 and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/apparelcuts-spreadshirt/resources/advanced-custom-fields/includes/acf-field-functions.php:1347)

This file is part of the WordPress plugin Apparelcuts Spreadshirt for Wordpress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wplocalplus-lite/includes/libraries/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin WP Local Plus and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/clean-social-icons/vendor/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Clean Social Icons and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/ms-header-bar/libs/advanced-custom-fields/includes/acf-field-functions.php:1347)

This file is part of the WordPress plugin MS Header Bar and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/advanced-custom-fields/includes/acf-field-functions.php:1385)

This file is part of the WordPress plugin Advanced Custom Fields and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/checkout-freemius-rewamped/pro/3rd_party/acf/includes/api/api-field.php:1365)

This file is part of the WordPress plugin Simple Freemius Shop and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/woocommerce-custom-tabs/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Woocommerce Custom Tabs and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wp-church-center/advanced-custom-fields/includes/api/api-field.php:1418)

This file is part of the WordPress plugin WP Church Center and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/realtypack-core/app/acf/includes/acf-field-functions.php:1354)

This file is part of the WordPress plugin RealtyPack Core and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/covid19-popup/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Coronavirus (COVID-19) Live Update Popup and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wowpi-guild/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin WoWpi Guild and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/rexpansive-page-builder/admin/lib/acf/advanced-custom-fields/includes/acf-field-functions.php:1347)

This file is part of the WordPress plugin Rexpansive Builder and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/landing-pages/shared/assets/plugins/advanced-custom-fields/includes/api/api-field.php:1418)

This file is part of the WordPress plugin Landing Pages and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/arrivala-online-business-reviews/vendor/advanced-custom-fields/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Arrivala - Online Business Reviews and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/leads/shared/assets/plugins/advanced-custom-fields/includes/api/api-field.php:1418)

This file is part of the WordPress plugin Leads and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/wpscreens/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin WPScreens and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/project-panorama-lite/lib/acf/master/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Panorama - WordPress Project Management Plugin and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare acf_duplicate_fields() (previously declared in wp-content/plugins/invition-print-ship/includes/acf/includes/acf-field-functions.php:1357)

This file is part of the WordPress plugin Invition Print & Ship and could be interacting with another theme or plugin and causing a fatal error.

The error occurs because two (or more) plugins that you are using are both trying to declare a function with the same name.