[Plugin: Events Manager] Call to a member function get() on a non-object in query.php on line 27

can you try to turn-on WP_DEBUG to see if there’s any other error?

These are the notifications I get in addition now on the homepage :

Notice: wp_deregister_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or init hooks. Please see Debugging in WordPress for more information. (This message was added in version 3.3.) in /homez.532/reebokcr/www/wp-includes/functions.php on line 3587

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /homez.532/reebokcr/www/wp-includes/functions.php on line 3553

In the admin panel I get the same add_option error and this error in addition :

Notice: Undefined index: page in /homez.532/reebokcr/www/wp-content/themes/good-minimal/functions.php on line 533

Hope this will give you a good hint… Thanks already !

can I know whats on this line? also, do you have a sample link?

Notice: Undefined index: page in /homez.532/reebokcr/www/wp-content/themes/good-minimal/functions.php on line 533

Sure, I’ve set up a test env on another server where i can give access if needed – https://nosta.net/TEST/

Line 533 is :
if ( $_GET['page'] == basename(__FILE__) ) {

It’s part of a function :

function mytheme_add_admin() {

    global $themename, $shortname, $options;

    if ( $_GET['page'] == basename(__FILE__) ) {

        if ( 'save' == $_REQUEST['action'] ) {

This is another error on the events pages:

Notice: Undefined index: current_sidebar in /homez.41/nosta4/www/TEST/wp-content/themes/good-minimal/page.php on line 37

<?php
				wp_reset_query();
				$custom = get_post_custom($post->ID);
				$current_sidebar = $custom["current_sidebar"][0];	// LINE 37

				if ($current_sidebar) {
					if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar($current_sidebar) ) :
					endif;
				}
			?>

your theme should be doing this

if ( !empty($_GET[‘page’]) && $_GET[‘page’] == basename(__FILE__) ) {

Thanks Marcus, this solved one of the errors that appeared in the admin panel after I enabled debug_mode.

However the other ones are still there, especially the original error I posted that I get on the main page, is still there. That one really breaks the page, as the others aren’t showed without debug mode.

I had the same error on upgrading using a custom theme. Try commenting out those lines – depending on what that function does for your theme you may have to code it in a different way…

I don’t really know where to look, only that it might be a problem with the slider?

It’s strange that the error points to the first function in query.php, wouldn’t it be a problem with any function in that file too?

Fatal error: Call to a member function get() on a non-object in /homez.532/nosta/www/wp-includes/query.php on line 27

Anyways I guess I’ll keep using version 5.1.3 for now unless a miracle happens :). Hopefully the problem will disappear again in a later version.

Thx for the help and tips.

I’ve upgraded to 5.1.7 and the error is gone again… weird. I would like to understand, so if anyone had an explanation i’d love to hear.

Curious if it will still work with the next update :).