Title: Fatal Error – PHP8 Incompatible
Last modified: March 18, 2021

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# Fatal Error – PHP8 Incompatible

 *  [rehhoff](https://wordpress.org/support/users/rehhoff/)
 * (@rehhoff)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-php8-incompatible/)
 * Hello.
 * Getting the following error/stack trace when uploading files on a bare wordpress
   install, running PHP 8.0
 * > [18-Mar-2021 17:10:37 UTC] PHP Fatal error: Uncaught TypeError: implode(): 
   > Argument #2 ($array) must be of type ?array, string given in wp-content/plugins/
   > advanced-uploader/upload.php:982
   >  Stack trace: #0 wp-content/plugins/advanced-
   > uploader/upload.php(982): implode() #1 wp-includes/class-wp-hook.php(292): 
   > advupl_attachment_fields_to_edit() #2 wp-includes/plugin.php(212): WP_Hook-
   > >apply_filters() #3 wp-admin/includes/media.php(1925): apply_filters() #4 wp-
   > includes/media.php(4116): get_compat_media_markup() #5 [internal function]:
   > wp_prepare_attachment_for_js() #6 wp-admin/includes/ajax-actions.php(2993):
   > array_map() #7 wp-includes/class-wp-hook.php(292): wp_ajax_query_attachments()#
   > 8 wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #9 wp-includes/
   > plugin.php(484): WP_Hook->do_action() #10 wp-admin/admin-ajax.php(187): do_action()#
   > 11 {main} thrown in wp-content/plugins/advanced-uploader/upload.php on line
   > 982
 * Kind Regards
    – Allan
    -  This topic was modified 5 years, 2 months ago by [rehhoff](https://wordpress.org/support/users/rehhoff/).

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## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [rehhoff](https://wordpress.org/support/users/rehhoff/)
 * Last activity: [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-php8-incompatible/)
 * Status: not resolved