IF node longest lacing

[mix]

Hello, I am trying to return several lists of list using an IF statement like below, however if it returns false, it only returns the first list. Is there something I am doing wrong? Am I using the wrong node perhaps? thanks in advance

[mix]

Ok, so it looks like I figured this one out by myself. I repeated the null list the same number of times as the other list and it looks like it took it!