javascript - Getting a stack overflow in this array merge -

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i've written short recursive function add blank entries every 30 minutes dataset. far can tell, function should tail-recursive, seems cause stack overflow.

just looking @ it, can't work out i've done wrong. advice welcome.

        function mergehelper(memo, merge, latesttime) {            var currenttime = moment(latesttime.subtract(30, "minutes")),              mergetime = moment(merge[0]),              thiselement = [currenttime, 0],              actualtime;              if (!merge.length) { //base case              return memo;            }              if (mergetime.isafter(currenttime)) { // normal case              memo.push(merge.pop);              actualtime = mergetime.clone();            } else { // failthrough case              memo.push(thiselement);              actualtime = currenttime.clone();            }            return mergehelper(memo, merge, actualtime);          }            return mergehelper([], data, initialtime);
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