aoData not defined when filtering

Using DataTables 1.9.4 there seems to be a bug. If you have used the search/filter option and no rows are visible, then you call "fnAddData" to add some additional rows and one of these rows matches the search/filter criteria, a popup appears. In the minimised version this is "e not defined", in the maximised version it's "aoData not defined". Does anyone know how to fix this?