Rollaz

Disabling all other plugins did not solve this issue.
For now moved to other plugin, will investigate later.
Thank you.

Nothing new, the same error when trying to enable plugin:
Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /home/series/domains/xxx/public_html/wp-admin/includes/class-wp-privacy-policy-content.php:232 Stack trace: #0 /home/series/domains/xxx/public_html/wp-content/plugins/x-complianz-gdpr/documents/admin-class-documents.php(47): WP_Privacy_Policy_Content::get_suggested_policy_text() #1 /home/series/domains/xxx/public_html/wp-content/plugins/x-complianz-gdpr/class-admin.php(68): cmplz_documents_admin->preload_privacy_info() #2 /home/series/domains/xxx/public_html/wp-includes/class-wp-hook.php(324): cmplz_admin->activation() #3 /home/series/domains/xxx/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #4 /home/series/domains/xxx/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #5 /home/series/domains/xxx/public_html/wp-admin/admin.php(175): do_action() #6 /home/series/domains/xxx/public_html/wp-admin/plugins.php(10): require_once('/home/series/do…') #7 {main} thrown in /home/series/domains/xxx/public_html/wp-admin/includes/class-wp-privacy-policy-content.php on line 232
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• This reply was modified 5 months ago by Rollaz.

Yes, that was the problem ?? Search now is working. Thank you!

Update ??
I inspected more with firebug, with debug turned on. So now in ajax response I see database error:

<p class='wpdberror'><strong>WordPress database error:</strong> [Got error 'empty (sub)expression' from regexp]<br />
			<code>
    		SELECT
          wp_posts.post_title as title,
          wp_posts.ID as id,
          wp_posts.post_date as date,
          wp_posts.post_content as content,
          wp_posts.post_excerpt as excerpt,
          wp_users.user_nicename as author,
          CONCAT('--', GROUP_CONCAT(DISTINCT wp_terms.term_id SEPARATOR '----'), '--') as ttid,
          wp_posts.post_type as post_type,
          ((case when
                (lower(wp_posts.post_title) REGEXP 'Array')
                 then 10 else 0 end) + (case when
                (lower(wp_posts.post_title) REGEXP '')
                 then 10 else 0 end) + (case when
                (lower(wp_posts.post_content) REGEXP 'Array')
                 then 7 else 0 end) + (case when
                (lower(wp_posts.post_content) REGEXP '')
                 then 7 else 0 end)) as relevance
    		FROM wp_posts
        LEFT JOIN wp_postmeta ON wp_postmeta.post_id = wp_posts.ID
        LEFT JOIN wp_users ON wp_users.ID = wp_posts.post_author
        LEFT JOIN wp_term_relationships ON wp_posts.ID = wp_term_relationships.object_id
        LEFT JOIN wp_term_taxonomy ON wp_term_taxonomy.term_taxonomy_id = wp_term_relationships.term_taxonomy_id
        LEFT JOIN wp_terms ON wp_term_taxonomy.term_id = wp_terms.term_id

    	WHERE
                (wp_posts.post_type REGEXP '[[:<:]]post[[:>:]]|[[:<:]]page[[:>:]]')
            AND (lower(wp_posts.post_status) REGEXP 'publish')
            AND (( lower(wp_posts.post_title) LIKE '%%' ) OR ( lower(wp_posts.post_content) LIKE '%%' ))
            AND (wp_posts.ID NOT IN (-55))
        GROUP BY
          wp_posts.ID

          ORDER BY relevance DESC, wp_posts.post_date DESC
        LIMIT 10</code></p>
			</div>!!ASPSTART!![]!!ASPEND!!

I guess it’s because of that commented line.

quick response ??
applied suggested changes – now plugin seems to be working but doesn’t find anything. Always returns !!ASPSTART!![]!!ASPEND!! in response.

On POST response I see an error:

Fatal error: Call to undefined function mb_convert_case() in /var/www/html/wp-content/plugins/ajax-search-lite/includes/search.class.php on line 41
(https://mydomain/wp-content/plugins/ajax-search-lite/js/nomin-scoped/asljquery.js?ver=3.8.1)

TypeError: response.match(…) is null
response = response.match(/!!ASPSTART!!(.*[\s\S]*)!!ASPEND!!/)[1];
(https://mydomain/wp-content/plugins/ajax-search-lite/js/nomin-scoped/jquery.ajaxsearchlite.js?ver=3.8.1)

And I can not give a link for you, because it is an internal page and it is not reachable outside my company.

Blind guess: can it be related with jQuery versions or something in php settings? I tried the same website and database set up on my local computer with random environment (easyPHP server don’t know exactly any PHP ir SQL versions) and search worked here as it is.