Do not rely on special values such as NaN, Inf, or empty arrays to determine if a VI produces undefined data. Instead, confirm that the VI produces defined data by making the VI report an error if it encounters a situation that is likely to produce undefined data.

For example, if you create a VI that uses an incoming array to auto‑index a For Loop, determine what you want the VI to do when the input array is empty. Either produce an output error code, substitute defined data for the value that the loop creates, or use a Case structure that does not execute the For Loop if the array is empty.