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I think this one remains also in 0.11:

I opened an assembly and wanted to change production. The game autosaved in this moment, and this takes some seconds. I managed in this time to click somehow/somewhere on the next assembly (the current dialog was still open). I don't know if there was some more else...

The result where two lost/unconnected item-choosers-windows left on screen. Any try to get rid of them failed, they where really unconnected.

I saved my game and quited and in this moment Factory crashes.

I actually had something similar the other day when I was editing a train stop name just as auto save happened. Right after autosave, I received an error message. I didn't report it because I couldn't reproduce it right away, but it does sound vaguely similar to your report.

alright, that explains what happened to me several times too. somehow managed to get two windows open, with one not beeing able to close anymore, followed by a factorio crash some seconds later.

https://forums.factorio.com/forum/vie ... 264#p42261

I think it is related to this problem.

I try to test a bit with turning off modules, maybe it's something with that?

Thanks for the report. I have managed to reproduce this for the assembling machine. The problem was when the item to choose from has been clicked more than once. This is now fixed for the 0.11.2.

The same thing happened for the train station. However there it just ended with a throw - the throw has been replaced by a silent fail for 0.11.2.

In general more than 1 entity window open is a death(crash) sign:D