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[Resolved] Critical error on

This thread is resolved. Here is a description of the problem and solution.

Problem:
Updating English translation on ACF option page results in the following fatal error .../httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php rivillä 328

Solution:
Make sure to enable WPML string Translations plugin to solve the issue.

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Last updated by ilariS 3 days, 8 hours ago.

Assisted by: Shekhar Bhandari.

Author Posts
April 22, 2026 at 6:48 am

ilariS

I believe I found a bug.

I tried updating English translation on ACF option page and got critical error on WordPress when trying to save. I can update the content on Finnish version of the option page without errors. The error did not occur on normal WordPress pages.

Attached some images of my setup.

Here is error message I got (in finnish):

WordPressin versio 6.9.4
Nykyinen teema: Divi (versio 4.27.6)
Lisäosa: Advanced Custom Fields Multilingual (versio 2.2.3)
PHP versio 8.3.30

Virheen lisätiedot
===================
Tiedoston /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php rivillä 328 havaittiin virhe lajia E_ERROR. Virheviesti: Uncaught Error: Undefined constant "ACFMLOptionsICL_STRING_TRANSLATION_COMPLETE" in /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php:328
Stack trace:
#0 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php(314): ACFMLOptionsEditorHooks->addToTranslationsQueue()
#1 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php(296): ACFMLOptionsEditorHooks->registerFieldTranslation()
#2 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/acfml/classes/Options/EditorHooks.php(165): ACFMLOptionsEditorHooks->onUpdateTranslationValue()
#3 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/class-wp-hook.php(343): ACFMLOptionsEditorHooks->onUpdateValue()
#4 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#5 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/advanced-custom-fields-pro/includes/acf-value-functions.php(244): apply_filters()
#6 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/advanced-custom-fields-pro/includes/acf-value-functions.php(287): acf_update_value()
#7 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/advanced-custom-fields-pro/includes/acf-form-functions.php(174): acf_update_values()
#8 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/class-wp-hook.php(341): _acf_do_save_post()
#9 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#10 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/plugin.php(522): WP_Hook->do_action()
#11 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/advanced-custom-fields-pro/includes/acf-form-functions.php(152): do_action()
#12 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-content/plugins/advanced-custom-fields-pro/pro/admin/admin-options-page.php(100): acf_save_post()
#13 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/class-wp-hook.php(341): acf_admin_options_page->admin_load()
#14 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#15 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-includes/plugin.php(522): WP_Hook->do_action()
#16 /var/www/vhosts/roimarantasavu.fi/httpdocs/wp-admin/admin.php(242): do_action()
#17 {main}
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