Wikimedia Bugzilla is closed!

Reproduce by create a new article with VisualEditor.

Return down about 10 lines.
Type some text, hit command+k (open link inspector)
Select an item in the dropdown. Hit enter.

Page may freeze but will eventually produce this stack error:

Uncaught TypeError: Cannot read property 'type' of undefined ve.dm.Transaction.js:214
ve.dm.Transaction.newFromAnnotation ve.dm.Transaction.js:214
ve.dm.SurfaceFragment.annotateContent ve.dm.SurfaceFragment.js:450
ve.ui.LinkInspector.onClose ve.ui.LinkInspector.js:172
ve.ui.Inspector.close ve.ui.Inspector.js:204
ve.ui.Context.closeInspector ve.ui.Context.js:341
ve.ui.Context.hide ve.ui.Context.js:255
ve.ui.Context.update ve.ui.Context.js:196
ve.ui.Context.onChange ve.ui.Context.js:86
(anonymous function) ve.EventEmitter.js:96
ve.EventEmitter.emit ve.EventEmitter.js:43
ve.dm.Surface.change ve.dm.Surface.js:278
ve.ce.Surface.onSelectionChange ve.ce.Surface.js:293
(anonymous function) ve.EventEmitter.js:96
ve.EventEmitter.emit ve.EventEmitter.js:43
ve.ce.SurfaceObserver.poll ve.ce.SurfaceObserver.js:178
ve.ce.SurfaceObserver.start ve.ce.SurfaceObserver.js:67
ve.ce.Surface.onUnlock ve.ce.Surface.js:313
(anonymous function) ve.EventEmitter.js:96
ve.EventEmitter.emit ve.EventEmitter.js:43
ve.dm.Surface.undo ve.dm.Surface.js:322
ve.HistoryAction.undo ve.HistoryAction.js:43
ve.Surface.execute ve.Surface.js:162
ve.ui.LinkInspector.onClose ve.ui.LinkInspector.js:161
ve.ui.Inspector.close ve.ui.Inspector.js:204
ve.ui.Inspector.onFormSubmit ve.ui.Inspector.js:102
proxy load.php:775
jQuery.event.dispatch load.php:3058
elemData.handle.eventHandle