Application error on certain invalid configurations

[jeroenverfallie]

Stumbled upon a full nextjs 'Application crash' while writing an invalid machine config.

Reproduction case:

createMachine({
    id: "application error",
    initial: "loading",
    states: {
        loading: {
            entry: {
                target: "list"
            }
        },
        list: {}
    }
})

Crashes immediately on edit, even before hitting Visualize. The crash persist after refresh, so you are forced to either clear the application storage, or quickly change the editor before it triggers.

[nobrayner]

I've encountered something similar, except for me it was when I saved machine with a target to a missing state (was about to add it).

Repro link: https://stately.ai/viz/8b20be22-3792-40f8-92e1-6761fae625bb