Tooltip fails when closing on an element that's removed

[WilcoFiers]

I'm using the tooltip on a delete button, which delete a row in a table. The button has a mouse enter/leave effect. When I click the button, which is then deleted with an animation, the following error is logged:
Uncaught TypeError: Cannot read property 'isOpen' of null

The following seems to fix the problem:
function toggleTooltipBind () {
if (!ttScope) return; // Check that the element still exists.
if ( ! ttScope.isOpen ) {
showTooltipBind();
} else {
hideTooltipBind();
}
}

[karianna]

plunkr please

[wesleycho]

Closing this issue as potentially old, and due to lack of reproduction.

Feel free to open a new issue if you are able to reproduce this on Plunker.

[btrauma8]

I can reproduce this with a plunkr!

http://plnkr.co/edit/gXcpxofs6PMJ1M7LaCfy?p=preview

my fix is just "if (!ttScope) return;" as first line of hide() function

[wesleycho]

That's a reasonable & simple fix - would you like to file a PR with it? If not, I can do so, but you should get the credit :) .

[SyntaxUnknown]

We're actually hitting this error in several other locations in our application:

        attrs.$observe( prefix+'Title', function ( val ) {
          Here --> ttScope.title = val;
          positionTooltipAsync();
        });

        attrs.$observe( prefix + 'Placement', function () {
         Here -->  if (ttScope.isOpen) {
            $timeout(function () {
              prepPlacement();
              show()();
            }, 0, false);
          }
        });

It seems for our issue, problem that ttScope is set to null here:

        // Make sure tooltip is destroyed and removed.
        scope.$on('$destroy', function onDestroyTooltip() {
          $timeout.cancel( transitionTimeout );
          $timeout.cancel( popupTimeout );
          unregisterTriggers();
          removeTooltip();
          ttScope = null;
        });

but the attrs.$observe() calls are not released. It seems those are still firing after $destroy happens in my tests.

For each attrs.$observe(), it should hold on to the return value and then call it during release, correct?

[wesleycho]

Good call - we need to investigate this further.