I received a crash on the last version (1.4.1):

https://imgur.com/a/IAlmBl5

Thanks.

Thanks for the report! Would you be able to describe what you were doing, or send the log file? https://wiki.factorio.com/Log_file#Log_file_location (factorio-current.log)

Was it a new save or a migrated from previous version save?

I can't say exactly what I was doing during the crash, but I had a controller in my hand.
Below is the crash log:

https://www.privfile.com/download.php?fid=5f5421c474d7a-MjgxNg==

Thanks for the log, that was really helpful, and with it I've worked out the source of the crash and it exposed generally buggy behaviour when you start a patrol where the spidertron is standing. This eventually led to the crash but it was acting weirdly before that.

I can't fix it right now, so until 1.4.2 don't start a patrol on the spidertron :)

Fixed in 1.4.2