ui-router: Syntax error, unrecognized expression: #/...

I recently started getting these errors when I click on a ui-sref link, EVEN THOUGH it still takes me to the given state / templateUrl. Here’s a small snippet from my app.js file:

        .state('prepare', {
            abtract: true,
            url: '/prepare',
            templateUrl: 'prepare/prepare.html',
            controller: 'prepareController'
        })
            .state('prepare.propinss', {
                url: '/propinss',
                templateUrl: 'prepare/question.html'
            })

The abstract state (‘prepare’) doesn’t cause an error to be recorded in the log, but the ‘prepare.propinss’ state does cause it:

Uncaught Error: Syntax error, unrecognized expression: #/prepare/propinss

BTW, the actual error itself comes from jquery.js:1437 (Sizzle.error = func…).

It seems I can safely ignore this error, but I’d prefer to eliminate it, just in case it does eventually cause me a real issue.

Thanks!