Version 4.7.13

system/Content/Search/Elastic/Query.php

@@ -396,7 +396,7 @@ class _Query extends \IPS\Content\Search\Query
 		{
 			$classes = array_merge( $object->classes, $classes );
 
-			if ( ! $object->similarContent )
+			if ( empty( $object->similarContent ) )
 			{
 				foreach( $object->classes as $class )
 				{