Since a few days ago, whenever I load my React + Redux app with the dev tools open, I get an error in the console saying:

Uncaught TypeError: toISOString is not a function
at String.toJSON ()

When I disable the Redux extension the error goes away. I suspect the issue has todo with the extension trying to parse/format my redux state and there is something that's causing issues.

The app I'm building is isomorphic, so I pass my store's initial state in a script tag. I would imagine that you'll be able to recreate the issue by simply trying to parse my initial state with the extension's parsing function.

Note that I do run the state.app section through immutable.fromJS on the client just before seeding the new store.

Im happy to send you the link to the site in question in a DM or something, just not 100% comfortable with posting it here.