Bug swf? emulator?

http://i.imgur.com/kFKwrOf.png

Can anyone tell me where is this bug?
And how to fix?
Thanks!!

What is the stack height for the chair that you are trying to sit on :-P

Quote:

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Originally Posted by TardisHotel

What is the stack height for the chair that you are trying to sit on :-P

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^ This.