Description
Bug, feature request, or proposal:
When a new Dialog containing a md-progress-spinner is opened, for the first time, IE throws an exception.
EXCEPTION: Unable to get property 'length' of undefined or null reference
eval code (7) (3064,13)
ORIGINAL STACKTRACE:
eval code (7) (3069,17)
TypeError: Unable to get property 'length' of undefined or null reference
at FocusTrap.prototype._getFirstTabbableElement (eval code:3021:9)
at FocusTrap.prototype._getFirstTabbableElement (eval code:3023:13)
at FocusTrap.prototype._getFirstTabbableElement (eval code:3023:13)
at FocusTrap.prototype._getFirstTabbableElement (eval code:3023:13)
at FocusTrap.prototype._getFirstTabbableElement (eval code:3023:13)
at FocusTrap.prototype.focusFirstTabbableElement (eval code:2992:9)
at Anonymous function (eval code:14701:13)
at SafeSubscriber.prototype.__tryOrUnsub (eval code:234:13)
at SafeSubscriber.prototype.next (eval code:183:17)
at Subscriber.prototype._next (eval code:125:9)
eval code (7) (3070,17)
SCRIPT5007: Unable to get property 'length' of undefined or null reference
Subscriber.js (238,13)
What is the expected behavior?
No Error
What is the current behavior?
Despite the error it seems to work fine.
What are the steps to reproduce?
The problem is reproduceable. Please ignore the errors when you start this. just focus on the error when you click "Launch Dialog". If you reopen the dialog, the error is gone, until you reload the page.