Crash when deleting task from context menu in Gantt Big Data Set Demo

[roddarn]

Steps to reproduce:

Open Gantt Big Data Set Demo
Right click on task.
Select Delete

gantt.module.js?468079:53 Uncaught TypeError: c[c1z(...)] is not a function
at MenuItem.onItem (gantt.module.js?468079:53:2182525)
at MenuItem.callback (gantt.module.js?468079:10:37667)
at MenuItem.trigger (gantt.module.js?468079:10:74473)
at MenuItem.doAction (gantt.module.js?468079:10:797353)
at Menu.triggerElement (gantt.module.js?468079:10:807511)
at Menu.onMouseClick (gantt.module.js?468079:10:803921)
at HTMLDivElement.o (gantt.module.js?468079:10:182374)