Why is my delete where statement not working?

I am trying to delete a user from table USERS. Unfortunately, I keep getting sent to onSqlError. I can't figure out why. When I alert the request it gives me the correct name for the getTheId variable. Not too familiar with sql so maybe I have written something incorrectly. Any pointers appreciated.

// DELETE RECORD
function deleteRecord(getTheId){
    deleteUser.onclick = (function () {//deleteUser is an element generated for each user when a button is clicked
        var sqlStr2 = 'DELETE FROM USERS WHERE username = '+getTheId+'';
        alert("SQL: " + sqlStr2); //This gives me the statement above with the correct name of the user clicked.
        if (db){
            console.log("db is there");//this logs
            db.transaction(function(tx) {  
                   tx.executeSql(sqlStr2);
            }, onSqlError, onSqlSuccess); //THEN I GET SENT TO ERROR
        }
    });
}