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I'm not positive that these are the exact steps to reproduce the crash, but I've seen this crash a dozen times or so.

1) Construction bots are building on top of trees
2) Researching something (have had crashes researching different topics)
3) Manually producing something (have had crashes building multiple things)

First seen in 0.17.4 but I just saw it again in 0.17.5

Platform: MacOS Mojave 10.14.3

Update - this crash does not seem to be related to researching or manual construction. Simply constructing a blueprint on top of some trees seems to trigger the crash pretty reliably.

Can you please upload the crash log as well? It's not crashing for me when I load up your save.

Sure - here are the last 2.

When these crashes occur, the application hangs and I have to kill the process.

For what it's worth, this crash doesn't seem to be occurring in 0.17.6 or 0.17.7.

Assume fixed: viewtopic.php?f=11&t=66280