Admin ajax php 500 internal server error

Hello,
Since the new version 2.4, I’m having problems in one computer (which is very strange), that does not load the media Library and Variations (modules with ajax). I’ve updated every plugin and WordPress 4.3 but it does not solve it. It has to be related with Woocommerce, because when I deactivate it, it does not have any problem.

This is the error message in Console:
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.3:5 POST https://equitienda.es/wp-admin/admin-ajax.php
500 (Internal Server Error)send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.3:5m.extend.ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.3:5j @ load-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,underscore,shortcode,backbone,wp-util,wp-b…:376(anonymous function) @ load-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,underscore,shortcode,backbone,wp-util,wp-b…:376

Regards.

How to fix ajax POST /wp-admin/admin-ajax.php 500 (Internal Server Error)? I’m receiving this error in console when I’m about to call my ajax code backend. It appears to me that I am missing global variable in enable the code to work. See the wrong and correct coding below. It might be not the same issue on you but you can found a clue how to fix 500 (Internal Server Error) error.

Wrong code, missing “global $wpdb;” global variable and this is causing 500 (Internal Server Error) error

// JS CODE
jQuery( document ).ready( function( $ ){
    $( '#gallery #select-friend' ).keyup( function(){
        $.ajax({
            url	: ajaxurl,
            type	: 'post',
            data	: {
                        action	: 'ys_creadit_to',
                        keyword : $( '#gallery #select-friend' ).val()
                    },
            success	: function(data){
                console.log(data);
            }
        });
    });
});
// PHP CODE
add_action( 'wp_ajax_ys_creadit_to', 'ajax_creadit_to' );
add_action( 'wp_ajax_nopriv_ys_creadit_to', 'ajax_creadit_to' );
function ajax_creadit_to(){
	$keyword = isset( $_POST['keyword'] ) ? explode( ' ', $_POST['keyword'] ) : array();
	$s = "";
	if( $keyword ) :
		foreach( $keyword as $id => $word ) :
			if( $id != 0 && ( ( count( $keyword ) - 1 ) < $id ) ) :
				$s .= " OR ";
			endif;
			$s .= "(display_name LIKE '%$word%')";
		endforeach;
	endif;
	$results = $wpdb->get_results( "SELECT ID, display_name FROM wp_users WHERE display_name LIKE '%$s%' LIMIT 0, 50" );
	print_r( $results );
	die();
}

Correct and working code

// JS CODE
jQuery( document ).ready( function( $ ){
    $( '#gallery #select-friend' ).keyup( function(){
        $.ajax({
            url	: ajaxurl,
            type	: 'post',
            data	: {
                        action	: 'ys_creadit_to',
                        keyword : $( '#gallery #select-friend' ).val()
                    },
            success	: function(data){
                console.log(data);
            }
        });
    });
});
// PHP CODE
add_action( 'wp_ajax_ys_creadit_to', 'ajax_creadit_to' );
add_action( 'wp_ajax_nopriv_ys_creadit_to', 'ajax_creadit_to' );
function ajax_creadit_to(){
	global $wpdb;
	$keyword = isset( $_POST['keyword'] ) ? explode( ' ', $_POST['keyword'] ) : array();
	$s = "";
	if( $keyword ) :
		foreach( $keyword as $id => $word ) :
			if( $id != 0 && ( ( count( $keyword ) - 1 ) < $id ) ) :
				$s .= " OR ";
			endif;
			$s .= "(display_name LIKE '%$word%')";
		endforeach;
	endif;
	$results = $wpdb->get_results( "SELECT ID, display_name FROM wp_users WHERE display_name LIKE '%$s%' LIMIT 0, 50" );
	print_r( $results );
	die();
}

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Hi there!
I have the weirdest problem ever!
Using enfold theme on my wordpress site. Getting error:
Domain.com/wp-admin/admin-ajax.php 500 (Internal Server Error) – domain.com/wp-admin/load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,utils,moxiejs,plupload&ver=5.5.1

This happen when I click on any ALB element on a page like slideshow, title etc.. the popup modal is gettion opened, the loading wheel sping for 3 seconds and than getting white blank.

Now thats the interesting part – this is only happen if I have more than 1740 *published pages* – as soon I move a few pages to the trash, and the total number of pages below 1740 – everything works perfectly!
Tried to increase php limit to 1g, change php version 7.1-7.4, debugging – nothing, deactivate & removed all plugins, optimize, clean & repair db, increase max_allowed_packet & innodb_buffer_pool_size, everything.
running latest wordpress version with the latest enfold release.
My only assumption is that somehow the admin-ajax.php close/abort the connection because of large query from database? Or timeout?

Anyone face something like that before? i searched the entire forum for the ajax 500 problem saw just a few that exactly related, tried every solution someone offer with no luck, i come to you as my last resort.
Thank you very much guys!

• This topic was modified 2 years, 4 months ago by ottwebtech.