I’m seeing these errors in debug mode after updating the plugin on a multisite installation:
Fatal error: Uncaught Error: Call to undefined function get_asp_result_field() in …/wp-content/plugins/ajax-search-lite/includes/classes/filters/class-asl-etc_fixes.php:57 Stack trace: #0 …/wp-includes/class-wp-hook.php(287): WD_ASL_EtcFixes_Filter->multisiteImageFix(Array, ‘6493’, ‘thumbnail’, false) #1 …/wp-includes/plugin.php(212): WP_Hook->apply_filters(Array, Array) #2 …/wp-includes/media.php(991): apply_filters(‘wp_get_attachme…’, Array, ‘6493’, ‘thumbnail’, false) #3 …/wp-includes/media.php(1028): wp_get_attachment_image_src(‘6493’, ‘thumbnail’, false) #4 …/wp-content/themes/twentytwelve-child/index-archive.php(78): wp_get_attachment_image(‘6493’, ‘thumbnail’, false, Array) #5 …/wp-includes/template.php(732): require(‘(root)…’) #6 …. in …/plugins/ajax-search-lite/includes/classes/filters/class-asl-etc_fixes.php on line 57
Line 78 in my index-archive.php (template file) calls a thumbnail image function: wp_get_attachment_image
The errors seem related to this.