TypeError: 'undefined' is not an object (evaluating 'db.transaction') tizen

i'am working on a project with Tizen for samsung Smart TV i'm using web SQL when i insert Data with this Code

  function insertData(db, name,category ,iconName,score) {
try {
   db.transaction(function (e) {
        console.log("start insert");
        try {
            e.executeSql(insertStatement,[name,category,iconName,score], 
      onSuccess, onError);
            } catch (e) {
            // TODO: handle exception
            console.log(e);
        }

    });
    } catch (e) {
    console.log(e);
  }

i have this error "TypeError: 'undefined' is not an object (evaluating 'db.transaction') tizen"