Is there any way to not wait for a subVI to output so that the background loop can continue (until the output exists)?

hello everyone,
I am in a loop but want to modify an element in that loop. This modification takes time, but i cannot have the loop stop while it is being changed or else the buffer overflows and crashes the computer.
Is there any way to make the output null until the subVI finishes and actually gives the desired output? This way the loop could continue until the subVI's output is ready.

Inside the subVI, you can set a condition, for example, if data is not given, set the output to some kind of value (NaN is good for numeric), if data is present, just take it out. But be sure the subVI has no loop to get data, but check data only once. If you need a loop to get data, you'll have to put it in paralell with the main loop.
Hope this helps

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