Query Mysql works in Workbench, but not in php script

Question

I did a search on this problem, found several with similar situation and, however, the problems were others. I have the following code where the query, if it is executed in the console, Mysql Workbench or phpmyadmin works perfectly.In this case, I checked the connection with the database and it is all right, because I modify the query to a very simple one, the script works correctly and brings the expected result. But with this query, the browser returns nothing, just a blank page. NOTE: Error messages are enabled in php.ini. Thank you!

<?php
require_once "conn.php";

$dbconnecta = mysqli_connect($server, $user, $pass);
if(!$dbconnecta) {
  die("Not connected: ". mysqli_error());
}else{
    mysqli_select_db($dbconnecta, $dba);
}

$query = "SELECT
n.nid,
a.field_dc_autores_nid,
n.title as titulo,
s.title as autor,
filename,
field_dublincore_source_value,
field_ano_da_publica_o_value,
art.name,
ed.name
FROM
node n
INNER JOIN
field_data_field_dc_autores a
ON a.entity_id = n.nid
AND n.type = 'conteudo'
INNER JOIN node s
ON a.field_dc_autores_nid = s.nid
AND s.type = 'autor'
INNER JOIN field_data_field_arquivo ar
ON ar.entity_id = n.nid
INNER JOIN file_managed
ON fid = field_arquivo_fid
INNER JOIN field_data_field_dublincore_source f
ON f.entity_id = n.nid
INNER JOIN ensp_producaocientifica.field_data_field_ano_da_publica_o ano
ON ano.entity_id = n.nid
INNER JOIN ensp_producaocientifica.field_data_field_grupo_da_producao_bibli
ON field_data_field_grupo_da_producao_bibli.entity_id = n.nid
INNER JOIN taxonomy_term_data art
ON tid = field_grupo_da_producao_bibli_tid
INNER JOIN field_data_field_dublincore_publisher pub
ON pub.entity_id = n.nid
INNER JOIN taxonomy_term_data ed
ON ed.tid = field_dublincore_publisher_tid
WHERE n.type = 'conteudo'
AND art.name like 'Artigos completos publicados em periódicos'
AND n.status = 1
AND n.nid = 369751
ORDER BY
nid DESC,
a.delta ASC
";
$dbresult = mysqli_query($dbconnecta, $query);
  while ($row = mysqli_fetch_array($dbresult)) {
  echo $row['titulo'] . "<br>";
 echo $row['field_ano_da_publica_o_value'];
}