I've found that if I copy & paste a node within a group, it locks up the Node-RED UI.
I'm using the latest version of Chrome on macOS... has any one else experienced this?
I get the following in the console if I copy and paste a node within a group and then attempt to move that group on the screen.
TypeError: Cannot read property 'addChild' of undefined
at x (red.min.js:16)
at Object.emit (red.min.js:16)
at Object.y [as addToGroup] (red.min.js:16)
at SVGGElement.$e (red.min.js:16)
at SVGGElement.i [as __onmouseup] (vendor.js:35)
emit @ red.min.js:16
y @ red.min.js:16
$e @ red.min.js:16
i @ vendor.js:35