Uncaught exception: TypeError: Cannot convert 'K' to object on editor.destroy();

[Tony]

I receive the following error when trying to destroy a CKeditor 3.4 instance using a plugin :

Uncaught exception: TypeError: Cannot convert 'K' to object
Error thrown at line 92, column 1741 in <anonymous function: getSnapshotData>():
    return K.getFrameDocument().getBody().getHtml();
called from line 114, column 4746 in <anonymous function: init>(o):
    o.data=l(n).getSnapshotData();
called via Function.prototype.call() from line 6, column 3258 in <anonymous function: on>(o, p, q, r):
    var s={name:d,sender:this,editor:o,data:p,listenerData:g,stop:q,cancel:r,removeListener:function(){l.removeListener(d,e);}};
called via Function.prototype.call() from line 6, column 4027 in <anonymous function: fire>(h, i, j):
    d=f=false;
called via Function.prototype.call() from unknown location in <anonymous function: fire>(b, c):
    /* no source available */
called from line 24, column 4875 in <anonymous function: getSnapshot>():
    var l=this.fire('getSnapshot');
called from line 87, column 1760 in <anonymous function: j.undo.Image>(r):
    var s=r.getSnapshot(),t=s&&r.getSelection();
called from line 88, column 831 in <anonymous function: save>(r, s, t):
    s=new l(v.editor);
called from line 87, column 277 in v(w):
    s.save();
called via Function.prototype.call() from line 6, column 3258 in <anonymous function: on>(o, p, q, r):
    var s={name:d,sender:this,editor:o,data:p,listenerData:g,stop:q,cancel:r,removeListener:function(){l.removeListener(d,e);}};

I guess that CKeditor's snapshot attempt is being fired after the editor has been destroyed? I have attached a small test plugin to make it easy to reproduce. The error was caught using Opera. The editor does destroy but the error message means not cleanly at a guess.

[Tony]

editor close test plugin for CKeditor

[Garry Yao]

It's impossible to guarantee absolute safety on destroyed instance since we're using a closure for referencing the "editor" variable all through our codes, considering this not a big issue we should just claim this as a convention in our API documentation.

Note: All instance methods of "CKEDITOR.editor" invocation is invalid after editor instance destroyed with "CKEDITOR.editor::destroy".

But we should at least error free for the attached TC.