How to avoid 'ID Not Found in Layout' with initial loading of app?

The below code functions correctly. The problem is that upon the initial loading of the app, the ID of the datatable cannot be found. I believe this is because it has not yet been created.

How do I avoid this errror?

from dash import dash, dash_table, html
from dash.dependencies import Input, Output, State
import pandas as pd
from dash.exceptions import PreventUpdate

app = dash.Dash(__name__, prevent_initial_callbacks=True)

app.layout = html.Div([
    html.Button('start', id='button1'),
    html.Button('start', id='button2'),
    html.Div(id='div1'),
    html.Div(id='div2')
])

@app.callback(
    Output('div1', 'children'),
    Input('button1', 'n_clicks'),
)
def generate_upload_file(n_clicks):  
    if n_clicks:
        df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/gapminder2007.csv')
        data_dict = df.to_dict('records')
        headers_list = list(df.columns.values)
        headers_dict = ([{'id': _, 'name': _} for _ in headers_list])
        return dash_table.DataTable(
            id='datatable1',
            data=data_dict,
            columns=headers_dict,
            filter_action="native",
            sort_action="native",
            sort_mode="multi",
            row_deletable=True,
            page_action="native",
            page_current= 0,
            page_size= 10,
        )
    else: raise PreventUpdate


@app.callback(
    Output('div2', 'children'),
    Input('button2', 'n_clicks'),
    State('datatable1', 'data'),
    )
def create_df(n_clicks, datatable_rows):  
    if n_clicks:
        df = pd.DataFrame.from_dict(datatable_rows)
        print(df)
    else: raise PreventUpdate

if __name__ == '__main__':
    app.run_server(debug=True)