If I click on the Explorers' Guild Button then in the Explorers' Guild window a new window appears.
It says to me: Select 1 more preperation(s). But there is nothing more to select for me.
So the game freezed and I have to restart it in the browser.
Currently I can not use the Explorers' Guild because the Error is reproduceable.
Maybe it is possible to check the count of possible chooseable preperations. If it is zero then do not show the window.