Thank you for the report. I was able to reproduce your issue if I tried to Play In Editor or Play In New Editor Window. I have submitted a bug report on this issue and expect it to be resolved in a future update.
Is there any more information regarding this bug? I am currently trying to implement a server browser system by using the shootergame as an example, this crash has be stuck also.
The developers are currently looking into this issue and are working to get it resolved. In the meantime, you can still Play it by choosing Standalone Game mode. I know it isn’t ideal but I just tested this in 4.2.1 and it works fine.
I’m not 100% sure if there is a hotfix for 4.2 and unfortunately I don’t have the release date for 4.3 at this time.
FYI the fix was to circumvent the host options and such if you are playing in editor - it makes no sense to do this from PIE anyway. You could add the checks yourself if its causing you major problems.