Error when playing against a custom AI

[Chapuz]

I found this message when trying to play against a custom AI:

Uncaught TypeError: Cannot read property 'type' of undefined, https://etg.dek.im/bundle.main.js, 36919, 47, TypeError: Cannot read property 'type' of undefined

I guess it has something to do with the last push

[serprex]

https://github.com/serprex/openEtG/commit/582fff10f9387052bcf0bd3f2631712a5de93f40