No idea why, it was random - wasn't on an enemy spawn or anything, was just vibing away in the 'time to get some resources' surface. I am using distant misfires, maybe something to do with that?

The mod Warptorio 2.0 (Space Age) (0.3.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event warptorio-space-age::on_tick (ID 0)
Can't create projectile, target not specified.
stack traceback:
[C]: in function 'create_entity'
warptorio-space-age/platforms.lua:234: in function 'spawn'
warptorio-space-age/platforms.lua:156: in function 'spawn_random'
warptorio-space-age/platforms.lua:116: in function 'on_tick'
warptorio-space-age/control.lua:1788: in function <warptorio-space-age/control.lua:1772>

This crash has by now happened several times

Testing around with your remote interfaces it seems like it crashes every time with platform 4 (which is the last size I have researched this game too and I am currently on)