I probably blame myself for bad coding, but sometimes I just want to be sure that everything is deleted before moving on, so I've ended up calling Particles.CleanUp() more than once on a particular occasion.

Particle Candy obviously doesn't like that, since it causes an error (not necessarily a crash), saying it can't remove an object in the Emitter variable that doesn't exist.

But, I made a small change in lib_particle_candy.lua that made the error go away, so you can call it multiple times without Particle Candy complaining.

In the bottom of the DeleteEmitter() function, change this:

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                -- REMOVE EMITTER
                Emitters[name].PTypes           = nil
                Emitters[name].PTypeIndex       = nil
                Emitters[name].PTypeSettings= nil
                Emitters[name]:removeSelf()
                Emitters[name]                          = nil
                if debug then print ("--> Particles.DeleteEmitter(): DELETED EMITTER '"..name.."'") end