Cannot update a component from inside the function body of a different component

[Grawl]

Runtime is started, but when I changed text in JSX like <p>some text</p> app crashes

Warning: Cannot update a component from inside the function body of a different component.
    in ConnectFunction (created by Context.Consumer)
    in withRouter(Connect(Router)) (at App.jsx:28)
    in Router (at App.jsx:27)
    in Provider (at App.jsx:26)
    in App (created by HotExportedApp)
    in AppContainer (created by HotExportedApp)
    in HotExportedApp (at src/index.jsx:12)