"TypeError: Unable to get property 'prop' of undefined or null reference" from bootstrap-ui-tpls

[josephhelmrich]

Bug description:

The positionTooltip function in UIBS contains this line at the top of the method to check for null tooltip objects:
if (!tooltip || !tooltip.html()) { return; }

But then it uses tooltip inside a $timeout without checking for nulls. I am getting about 100 "Unable to get property 'property' of undefined or null reference" exceptions per day from my app which has about 4000 users.

Link to minimally-working plunker that reproduces the issue:

I can only produce this in IE and not 100% of the time. If I moving my mouse rapidly back and forth between the two buttons that show tooltips within 10 seconds or so I usually get an exception in the console.
http://plnkr.co/edit/neahF8CxbhgQj17P3OkS?p=preview

Version of Angular, UIBS, and Bootstrap

Angular: v1.5.8

UIBS: 2.1.3

Bootstrap: 3.3.7

[icfantv]

The issue is because you have a delay on your tooltips opening and the trigger is a mouseenter event. The issue goes away when you remove that delay. If you feel you need that delay, we should have a discussion as to why. I'm not saying this isn't a bug, but I am wondering if your use case is not correct.