When setting the Kill Particles boolean of an emitter in a Niagara System to true, the editor crashes. So far, I've only been able to reproduce the issue with the NS_EH_KP system that a user provided for the repro. When trying to create a similar Niagara System from scratch I've been unable to reproduce the issue.
The user also added additional info: "The crash consistently happens when an emitter receives location data from another spawning emitter, "requires persistent ID" checked and activates "Kill Particles" module under the Event Handler."
The editor crashes
The editor doesn't crash when setting Kill Particles to true
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-116216 in the post.