refernced memory at "0x27581771" error at the time of IE close

I have made an OCX (in VB) that we use to loaded in IE6.0. IObjectSafety interface is used in the ocx for Object safety.

Problem is at the time of closing the IE. When we close IE then it is giving reference memory error
Error detail: The instruction at "0x27581771" refernced memory at "0x27581771". The memory could not be "read".

1) are you using any external files or databasses which aren't being unloaded properly when your app/control exits?

2) Can you run this in the vb ide okay or does the debugger specify an error line?

3) What parameters does the IObjectSafety call use (as I can only find C++ sameples using this) and what values are you passing to these parameters?

Are you using 'End' ?