I Passed Text successfully into my SQLite db but my app is crashing when i try to pass selected checkbox values to SQLite db

i have a functional DBhelper class extended to SQLiteOpenhelper which successfully created and populates my database. However when i try to populate the database with checked box values my app crashes. I believe its something wrong with my piece of code which says controller.insert_checkbox(checked), because when i comment it out my code runs and shows the toast that follows on the screen. Here is my code;

public class LocationCategoryChkbxNew extends AppCompatActivity {

Button button2;
CheckBox chkbox15;

int checked = 0;
ResturantsDbHelper controller;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_location_category_chkbx_new);

    controller = new ResturantsDbHelper(this);
    button2 = (Button)findViewById(R.id.button2);
    getSupportActionBar().setTitle("Your Foodometer:  Hungry ..");

    chkbox15=(CheckBox)findViewById(R.id.checkBox15);
    chkbox15.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked){
                checked = 1;
                }else {
                checked = 0;
            }
        }
    });
    button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            controller.insert_checkbox(checked);
            Toast.makeText(getApplicationContext(), "Saved '"+ checked + "' in DB", Toast.LENGTH_SHORT).show();

            Intent myIntent = new Intent(LocationCategoryChkbxNew.this,
                               ResturantCategoryChkboxNew.class);
                       startActivity(myIntent);
        }
    });

}

And here is my DBHelper class public class ResturantsDbHelper extends SQLiteOpenHelper { private static final String TAG ="DatabaseHelper";

// FIRST DB - Name of the resturant database file. if you change the DB Schema you must increment the database version
private static final String DATABASE_NAME1 = "Resturants.db";
//Resturant Database version
private static final int DATABASE_VERSION1 = 1;

//import LocationCategoryChkbx class
//private LocationCategoryChkbx;

public ResturantsDbHelper(Context context){
    super(context, DATABASE_NAME1,null, DATABASE_VERSION1);
}

//watching the spacing, you cannot leave spaces after the comma and quote at the end of each statement below
@Override
public void onCreate(SQLiteDatabase db) {
    String SQL_CREATE_RESTURANTS_TABLE = "CREATE TABLE " + ResturantEntry.TABLE_NAME + "("
            + ResturantEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
            + ResturantEntry.COLUMN_NAME + " TEXT NOT NULL,"
            + ResturantEntry.COLUMN_TYPE + " TEXT NOT NULL,"
            + ResturantEntry.COLUMN_ADDRESS + " TEXT NOT NULL,"
            + ResturantEntry.COLUMN_LOCATION + " TEXT NOT NULL,"
            + ResturantEntry.COLUMN_GPSCOORDINATES + " INTEGER NOT NULL,"
            + ResturantEntry.COLUMN_TELEPHONE + " INTEGER NOT NULL,"
            + ResturantEntry.COLUMN_OPENINGHOURS + " INTEGER NOT NULL,"
            + ResturantEntry.COLUMN_CLOSINGHOURS + " INTEGER NOT NULL,"
           + ResturantEntry.COLUMN_CHECKBOX + " TEXT);";

    db.execSQL(SQL_CREATE_RESTURANTS_TABLE);


}

@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
    db.execSQL(String.format("DROP IF TABLE EXISTS %s", TABLE_NAME));
    onCreate(db);
       }

//We create a method for adding data to the database, we will call it “Insert_data” //public boolean insert_data(String s, String trim, String item, String trim1, String s1, String trim2, String s2, String trim3){ public void insert_data (String mResturantName, String mAddress, String mRestTypeSpinner, String mLocationSpinner, String mGPS_coordinates, String mTelephone, String mOpeningHour, String mClosingHour){ SQLiteDatabase db = this.getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put(ResturantContract.ResturantEntry.COLUMN_NAME, mResturantName ); contentValues.put(ResturantContract.ResturantEntry.COLUMN_TYPE, mAddress); contentValues.put(ResturantContract.ResturantEntry.COLUMN_ADDRESS, mRestTypeSpinner); contentValues.put(ResturantContract.ResturantEntry.COLUMN_LOCATION, mLocationSpinner); contentValues.put(ResturantContract.ResturantEntry.COLUMN_GPSCOORDINATES, mGPS_coordinates); contentValues.put(ResturantContract.ResturantEntry.COLUMN_TELEPHONE, mTelephone); contentValues.put(ResturantContract.ResturantEntry.COLUMN_OPENINGHOURS, mOpeningHour); contentValues.put(ResturantContract.ResturantEntry.COLUMN_CLOSINGHOURS, mClosingHour);

this.getWritableDatabase().insertOrThrow(ResturantContract.ResturantEntry.TABLE_NAME,"",contentValues);

}

public Cursor getResturantList(){

    SQLiteDatabase database=this.getWritableDatabase();
    Cursor resturantdata;
    resturantdata = database.rawQuery("SELECT * FROM " + TABLE_NAME,null);

    return resturantdata;


}


public void insert_checkbox(int checked) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(ResturantContract.ResturantEntry.COLUMN_CHECKBOX, checked );

    this.getWritableDatabase().insertOrThrow(ResturantContract.ResturantEntry.TABLE_NAME,"",contentValues);


}

}

I will appreciate any help, I have been battling this for 2 days now