Error in javascript Uncaught Syntaxerror: Missing ) after argument list

Question

I have a code that changes the value in the bank from 0 to 1 or vice versa, in 80% of cases it manages to make the change but sometimes gives this error Uncaught SyntaxError: missing ) after argument list and I’ve tried to see the bank part and found nothing wrong

JS

function enviaAssociado(CTITULAR) {
if(CTITULAR){
    $("#CTITULAR").remove();
    $.ajax({
        url: 'php_action/enviaAssociado.php',
        type: 'post',
        data: {CTITULAR : CTITULAR},
        dataType: 'json',
        success:function(response) {
            manageTable.ajax.reload();
            //$("#CTITULAR").val(response.CTITULAR);
        }
           });
    }
    manageTable.ajax.reload();
}

PHP

<?php 
require_once 'db_connect.php';
if($_POST) {

    $CTITULAR = $_POST['CTITULAR'];


    $sql = "    UPDATE importsmiles4e.tb_conv
    SET    STAT = CASE
         WHEN  STAT = 1 THEN 0
         WHEN  STAT = 0 THEN 1
         ELSE STAT
       END
    WHERE  substring(CTITULAR,2,6) = '$CTITULAR'";
    $query = $connect->query($sql);

    $CTITULAR = $_POST['CTITULAR'];


    $sql = "    UPDATE importsmiles4e.tb_conv3
    SET    STAT = CASE
         WHEN  STAT = 1 THEN 0
         WHEN  STAT = 0 THEN 1
         ELSE STAT
       END
    WHERE  substring(CTITULAR,2,6) = '$CTITULAR'";
    $query = $connect->query($sql);



    $connect->close();


}
?>