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In researches I did, this can be a problem in some PHP code, and to detect a precise log of the errors that are occurring.
To solve, I followed the tutorial on this page: https://www.hostinger.com.br/tutorials/comorverifica-os-logs-de-erro-php-do-seu-site/#1o-Passo-Habilitar-os-Logs-de-Erro
To enable error logs you will have to add the following line to file:
php_flag log_errors on
Then we will have to determine a location for the logs to be stored. For our example we created the error_log.txt file on public_html directory. For logs to be stored in the file created, insert the following line into . htaccess:
php_value error_log /home/usuario_FTP/public_html/error_log.txt
NOTE: Don’t forget to change user_FTP for your user. At Hostinger the default is the letter "u" followed by 9 numeral digits. Example: u497135640.
With these settings the error logs will be stored in the error_log.txt file located in the public_html folder.
With that the log presented me the problem: