Unable to resolve issue in issue tracker

Clicking ‘resolve’ in issue tracker does nothing.

Console shows error:

Uncaught TypeError: e.className.match is not a function
at o (blanket.js:43)
at blanket.js:48
at HTMLCollection.forEach (<anonymous>)
at s (blanket.js:47)
at Object.t (dialog.js:146)
at Object.show (dialog.js:161)
at a.show (dialog.js:896)
at HTMLAnchorElement.a (bind-transitions.js:150)
at HTMLAnchorElement.dispatch (jquery.js:4435)
at HTMLAnchorElement.g.handle (jquery.js:4121)
at HTMLAnchorElement.n (raven.js?ae06***:377)