TypeError: Cannot read property 'type' of undefined(…)

Hi,

the plugin works properly, until i make changes to the docs. after changing the props or geometry of a doc i get

> TypeError: Cannot read property 'type' of undefined(…)
> even deleting the db just helps if a sync with remotedb wasn't done. if the sync with remotedb is done the error message is the same.
> Any ideas?

Thx in advance
