Hello! I need to save comments count to the article field. 
For this purpose I've tried to create a Sync entry looking like this and with the code (field_id is 12) :
<?php
$columns = ['field_id', 'item_id', 'value'];
// $data = [12, $object_id, $comment_count];
$data = [12, 42, 4];
$query = $db->getQuery(true)
            ->insert($db->qn('#__fields_values'))
            ->columns($db->qn($columns))
            ->values($data);
//$db->setQuery(substr_replace($query, 'REPLACE ', 0, 8));    // swap INSERT for REPLACE
$db->setQuery($query);
$db->execute();
?>
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But the result of this code is nothing and the log is "entry_updated: Column count doesn't match value count at row 1".  
How should I save comments count to the article field with field_id 12?