Unsupported operand types: int * string in lib/search.php:918

Hi there,

I’m getting this intermittent – as in, it happens for some search terms but not for others – error when searching in the front-end:

Unsupported operand types: int * string in /blahblahblah/public_html/wp-content/plugins/relevanssi/lib/search.php:918

If I do some debugging of that code:

        $weight = $post_type_weights[ 'post_tagged_with_' . $tax ] ?? null;
        write_log($weight); // $weight is null at this point
        
        if ( ! $weight ) {
            $weight = $post_type_weights[ $tax ] ?? 1;
        }
        write_log($weight); // but it's still blank now, and that's because         $post_type_weights looks like: Array
(
    [post_tag] => 0.75
    [category] => 
)

        // so if I add something like this:
        if ( ! $weight ) {
            $weight = 1;
        }
        // then the error doesn't happen, but otherwise doing this throws that int * string error:
	$match_object->taxonomy_score += $count * $weight;

Any ideas, please? As I say, if I add a hack to force $weight = 1 then I can get around it, but I don’t want to put my ugly code in your marvellous plugin if I can help it…!

Thanks very much.

ian.