When the content is configured to be displayed in a new window, it is possible for the user to get back into the parent window and navigate away from it.
Such a behavior correctly fires a close command against the SCORM content window but... this will happen when the SCORM RTE (API) has been already removed from the parent window and the content - which usually "close" the session using code called in body@unonload - is not able to correctly "finish" the tracking session being LMSFinish() no more available.
The same applies with SCORM 2004 and potentially with 2.0.x.
- will be (partly) resolved by
MDL-28295 SCORM crashing in IE 7 and above when httpreq is called under certain conditions when using SCORM popups