Problem with custom insert in custom module with normal user role

Hello friends,

First of all I apologize for my level of English.

I request your help because I have a problem with a custom module that I created following a tutorial.

With the administrator everything goes me perfect but with a normal user it gives me error in the following instruction.

<?php
$query = \Drupal::database()->insert('linkdescarga');
	$query->fields([
	  'clave',
	  'FACT_NomApe',
	  'FACT_Cif',
	  'FACT_Direccion',
	  'FACT_Cp',
	  'FACT_Ciudad',
	  'FACT_Actividad',
	  'FACT_Ficheros'
	]);
	$query->values([
	  $clavefichero,
	  $FACT_NomApe,
	  $FACT_Cif,
	  $FACT_Direccion,
	  $FACT_Cp,
	  $FACT_Ciudad,
	  $FACT_Actividad,
	  $FACT_Ficheros
	]);
	$query->execute();
?>

The execute command fails with a normal user. The table in which I will insert the I have created myself directly in the database.

Do you know what I can do? I have been dealing with this problem for several days and I can not solve it.

Thank you very much for your help.

A greeting