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Application Restarting every time

Hello,

I am building a multi page application.

I have a side bar to navigate between pages.

When I in a page, whenever I choose a Select , the application restarts again.

It sometimes doesnot happen, and a lot of times the application restarts.

In my developer console, I get these errors


Error:
key is not a prop. Trying to access it will result in undefined being returned. If you need to access the same value within the child component, you should pass it as a different prop.


Error:
Warning: Each child in a list should have a unique “key” prop. See https://fb.me/react-warning-keys for more information.


Error:
Warning: Each child in a list should have a unique “key” prop. See https://fb.me/react-warning-keys for more information.


Error:
POST http://127.0.0.1:8888/_dash-update-component

error5
Error: server did not respond as it restarts

All of the code is in this repository

I am not sure why these error happen sometimes, and sometimes they do not Or how to resolve the restarting of the application.

Please, any help is appreciated

I also get this error sometimes

Can’t perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.

These are just warnings not errors and they come from the components themselves, not your code. You can ignore every message that says “warning” and not “error”.