Clicking recursion Krumo item causes JS error

When expanding the output of Krumo, some of the items with recursive references display an infinity symbol and say "(Recursion)". Clicking one of these produces a JS error in the browser console:

19202:103 Uncaught TypeError: Cannot read property 'parentNode' of undefined
    at Function.krumo.toggle (19202:103)
    at HTMLDivElement.<anonymous> (js_AFbjbsV2cYTenb29BW_h7YBVeoRaQyzM6zhA5YSVwpY.js:100)
    at HTMLDivElement.dispatch (js_2K4gFKukSXKilPtIgKPD0P_AAHilQqiA2LVkNxK5ab4.js:3)
    at HTMLDivElement.r.handle (js_2K4gFKukSXKilPtIgKPD0P_AAHilQqiA2LVkNxK5ab4.js:3)
krumo.toggle @ 19202:103
(anonymous) @ js_AFbjbsV2cYTenb29BW_h7YBVeoRaQyzM6zhA5YSVwpY.js:100
dispatch @ js_2K4gFKukSXKilPtIgKPD0P_AAHilQqiA2LVkNxK5ab4.js:3
r.handle @ js_2K4gFKukSXKilPtIgKPD0P_AAHilQqiA2LVkNxK5ab4.js:3

You can still double-click to expand/contract the row to see the extra information, but each individual click causes an error.