I'm using facetoface version 2012140604 with moodle version 2.3.3.
Uncaught TypeError: Cannot call method 'get' of null in yui_combo.php:352
line 352 is this name : element.one(CSS.INSTANCENAME).get('firstChild').get('data')
I don't get this error deleting any other activity or resource for a course page on the facetoface activity.
I'm hoping someone can test this with the same versions I have to confirm if it's just me or if it's a bug.