Subflows are not deployed successfully by dnr-editor

[SrinivasAiyar]

On the Node-RED client the following method in Flows.js receives an undefined value for sf, resulting in access violation:
function createSubflow(sf,sfn,subflows,globalSubflows,activeNodes)

My subflow is::
[{"id":"4ff24a4d.e87f64","type":"subflow","name":"ipconfig","info":"","in":[{"x":162.50003814697266,"y":501.40003395080566,"wires":[{"id":"140d8d8a.0af372"}]}],"out":[{"x":612.1000137329102,"y":499.2000136375427,"wires":[{"id":"d049bacd.c36e98","port":0}]}]},{"id":"140d8d8a.0af372","type":"hostip","z":"4ff24a4d.e87f64","name":"Host IP","x":302.50003814697266,"y":501.40003395080566,"wires":[["d049bacd.c36e98"]]},{"id":"d049bacd.c36e98","type":"function","z":"4ff24a4d.e87f64","name":"Get IP","func":"\nvar ipv4 = msg.payload[0]\nmsg.payload = ipv4.address\nreturn msg;","outputs":1,"noerr":0,"x":482.10001373291016,"y":499.2000136375427,"wires":[[]]},{"id":"f4800a16.a32368","type":"subflow:4ff24a4d.e87f64","z":"55defe8b.eb37a","name":"","x":632,"y":234,"wires":[["1c73bf63.567651"]],"constraints":{"wolf":{"id":"wolf","deviceName":"wolf","fill":"#c66803","text":"wolf"}}}]