Insert statement does not insert anything into the DB and shows no error [closed]

I have this statement ready to insert data, although it receives and leaves it inserted, it does not insert anything in the database:

Echo of the variables:

 echo "<br>".$unidad;
 echo "<br>".$cedula1;
 echo "<br>".$cedula2;
 echo "<br>".$cedula3
 echo "<br>".$articulo_falta;
 echo "<br>".$aparte_falta;
 echo "<br>".$documentos_implode;
 echo "<br>".$fecha_inicio;
 echo "<br>".$fecha_termino;
 echo "<br>".$dias;
 echo "<br>".$aclaratoria;
 echo "<br>".$estado_sancion_id;
 echo "<br>".$tipo_medida;
 echo "<br>".$tipo_circunstancia;
 echo "<br>".$atenuantes_implode;
 echo "<br>".$agravantes_implode;
 echo "<br>".$total_demerito;
 echo "<br>".$lugar;

Data of the Echo

033100000000
17739707
8644097
8644097
35
1
2-1
2017-03-23
2017-03-24
1
qwrqwrwq
1
2
40
3-4
0
6.55
2

Sentence

$stmt = $conexion->prepare("INSERT INTO sanciones (
      unidad,
      cedula_sancionado,
      cedula_sancionador, 
      cedula_superior, 
      articulo_falta, 
      aparte_falta, 
      documento_seleccion,
      fecha_inicio, 
      fecha_termino, 
      dias_sancion, 
      aclaratoria_sancion, 
      estado_sancion_id,
      medida_id,
      articulo_circunstancias,
      agravante_seleccion, 
      atenuante_seleccion, 
      total_demerito, 
      estado_lugar_id) 
      VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");
var_dump($stmt);

$stmt->bind_param("siiiiisssisiiissdi"
 ,$unidad
 ,$cedula1
 ,$cedula2
 ,$cedula3
 ,$articulo_falta
 ,$aparte_falta
 ,$documentos_implode
 ,$fecha_inicio
 ,$fecha_termino
 ,$dias
 ,$aclaratoria
 ,$estado_sancion
 ,$tipo_medida
 ,$tipo_circunstancia
 ,$agravantes_implode
 ,$atenuantes_implode
 ,$total_demerito
 ,$lugar);
$stmt->execute();

var_dump($stmt);

if ($stmt){
echo ('<script>alert("OMD generada satisfactoriamente!");</script>');
/*echo ("<script>window.location = 'menu_unidades.php';</script>");*/
$stmt->close();
}else{
    echo ('<script>alert("No se pudo generar la OMD");</script>');
    echo ("<script>window.location = 'menu_generar_omd_unidades.php';</script>");
}

"OMD generated successfully" exits but does not insert into the database

It started to fail when you add $ unit to the insert. the table has 19 fields (one is the auto-incremental ID)

The problem was that when the person entered some data this was disabled, to avoid that I decided to clone the text fields and when a field was filled it got its value, it turns out that several INT values were converted to STRING, multiplied by 1 the variables

Now the bind_param fails me