Corpus labeling throws javascript error on firefox

[jmansilla]

Error is raised when clicking on the first EntityOccurrence.
(using firefox 37.0.2)

"Error: event is not defined
$scope.eo_click@http://localhost:8000/static/js/document_questions.js:196:1
fb.prototype.functionCall/<@http://localhost:8000/static/js/vendor/angular.min.js:177:66
lc[c]</<.compile/</</f@http://localhost:8000/static/js/vendor/angular.min.js:194:174
Zd/this.$get</k.prototype.$eval@http://localhost:8000/static/js/vendor/angular.min.js:112:64
Zd/this.$get</k.prototype.$apply@http://localhost:8000/static/js/vendor/angular.min.js:112:341
lc[c]</<.compile/</<@http://localhost:8000/static/js/vendor/angular.min.js:194:224
_.event.dispatch@http://localhost:8000/static/js/vendor/jquery.js:25:1040
_.event.add/q.handle@http://localhost:8000/static/js/vendor/jquery.js:24:30041"