PHP Fatal error when trying to edit Posts with MFB activated
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Hi,
I get a PHP Fatal error when trying to edit Posts in admin. It seems to be related to MFB (I’m not sure).
I deactivated the plugins one by one, and when MFB is deactivated everything is working fine again.
I installed the previous versions of MFB : same issue.
In the last weeks, I did not change any code in my theme / any settings . I just updated plugins …
Thanks for help
WordPress 6.8.2
Secure Custom Fields 6.5.7My LOG :
[29-Aug-2025 04:46:20 UTC] PHP Fatal error: Uncaught TypeError: Illegal offset type in isset or empty in /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/api/api-helpers.php:2542
Stack trace: 0 /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/fields/class-acf-field-select.php(660): acf_maybe_get() 1 /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/fields/class-acf-field-select.php(636): acf_field_select->format_value_single() 2 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/class-wp-hook.php(324): acf_field_select->format_value() 3 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/plugin.php(256): WP_Hook->apply_filters() 4 /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/acf-hook-functions.php(110): apply_filters_ref_array() 5 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/class-wp-hook.php(324): _acf_apply_hook_variations() 6 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() 7 /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/acf-value-functions.php(191): apply_filters() 8 /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/rest-api/class-acf-rest-api.php(242): acf_format_value() 9 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api/endpoints/class-wp-rest-controller.php(439): ACF_Rest_Api->load_fields() 10 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(2098): WP_REST_Controller->add_additional_fields_to_object() 11 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(655): WP_REST_Posts_Controller->prepare_item_for_response() 12 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api/class-wp-rest-server.php(1292): WP_REST_Posts_Controller->get_item() 13 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api/class-wp-rest-server.php(1125): WP_REST_Server->respond_to_request() 14 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api.php(586): WP_REST_Server->dispatch() 15 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/rest-api.php(2973): rest_do_request() 16 [internal function]: rest_preload_api_request() 17 /home/u000000010/domains/mywebsite.org/public_html/wp-includes/block-editor.php(754): array_reduce() 18 /home/u000000010/domains/mywebsite.org/public_html/wp-admin/edit-form-blocks.php(114): block_editor_rest_api_preload() 19 /home/u000000010/domains/mywebsite.org/public_html/wp-admin/post.php(187): require(‘/home/u000000010…’) 20 {main}
thrown in /home/u000000010/domains/mywebsite.org/public_html/wp-content/plugins/secure-custom-fields/includes/api/api-helpers.php on line 2542
Thanks
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Hey, thanks,
I have no idea how you can reproduce this.
It happens for the Posts, that I can not Edit, and not even Create new.
And also for 1 CPT, where I can create New, but not Edit.
But not for the other CPT’s (using SCF fields as well), no problem at all !
= complex to understand
I tried to find if it is a specific ACF field type causing the issue, but I did not find any logic.
On frontend, the website is working fine. Issue is in Admin.
I do not have any previous versions of SCF on my computer …
Without MFB, SCF is working fine. I don’t understand how the one can be affected by the other. I checked again and again my functions.php , I see no reason (and I did not change the code since many weeks)
I will let some hours for my brain to relax, maybe I’ll find some light later 😀
Thanks again
EDIT : Later I will try deactivate all filters in my functions.php, one by one, to be sure it’s not the cause.@charlie67p Thank you for sharing your data. I found the root cause of this issue, you can find the details here https://wordpress.org/support/topic/fatal-error-when-trying-to-edit-post-2/#post-18620193
I may need to update the code to support some field types for SCF if my proposal isn’t accepted.
Hi @mr2p , any news from SCF side ?
Is there a work around that I can use in order to have both plugins in their last version (without conflict) on my website ?
I can not update my Posts unless I downgrade SCF (that is not a good idea for the security of the website..)
– now that my customer asks for many updates, the situation is really problematic –
Thank you
Edit :
You wrote it causes this error for some multiple value field types like SELECT – Can you tell me which types of ACF fields have ”multiple value” ? >> I can try to temporarily deactivate these fields, in order to be able to update my Posts.
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