TypeError: Cannot read properties of undefined (reading ‘length’) in ract

This code is showing blank white page.
In console I’m getting the error
The above error occurred in the <Navbar> component:

at Navbar (http://localhost:3000/main.4cfe4d29217934eeb96f.hot-update.js:69:63)
at div
at App (http://localhost:3000/static/js/bundle.js:774:76)
at Router (http://localhost:3000/static/js/bundle.js:450201:15)
at BrowserRouter (http://localhost:3000/static/js/bundle.js:448154:5)
at Provider (http://localhost:3000/static/js/bundle.js:445012:3)

Can anyone please help me out!

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