An ArrayIndexOutOfBoundsException occurred when I used the method withReomved(Collection<IPRange>)

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Hello, when I used the method withRemoved(Collection<IPRange> ranges), if this IPRange All removed by ranges, and ranges still have elements, ret.remove() will throw an ArrayIndexOutOfBoundsException. If ret.size equals to 0, it should return an empty list in advance, similar to the method withRemoved(IPRange).