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How to check if Niagara System Finished?

I created multiply Niagara Systems from scratch,

I have problem with checking when it’s finished (Loop is set to Once) in Actor BP.

Is there Any way to check, if the loop is over in Actor Blueprint?

I can’t find anything about this.

You may be able to prove the lifetime variable by creating a function that returns it as a scratchpad maybe?
if not, perhaps you can directly query it off the system…