I believe there is really something very wrong within your LaserBlaster_BP uasset file or usage of it in game code by other Blueprints; maybe it is corrupted, I don’t know.
I’ve built 1.3.8 and submitting soon; this time you will be able to package, but if you get a crash when running the packaged game then that really means your LaserBlaster file is somehow messed up and this isn’t really a plugin bug at all, it’s the Blueprint file… Sending 1.3.8 to Marketplace team now.