InvalidArgumentException on psPageableFormPlugin when click on browser back button

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PHP

plugin

Here is the scenario.

I have some form which is implemented with psPageableFormPlugin in symfony 1.4.8. For example I have 3 steps, and I go through all steps, enter some data confirm the form, (data has been inserted on database) and everything is fine. After that I had been redirected on some other form, but when I go back (not with some previous button on my form, but with back button on browser - this is important for this error) and then click next on final step this error would appear.

"4" - invalid page value for form MyPageableForm, possible value from 1 to 3

I guess what is wrong (maybe session data stores 3 steps and when I go back and next again this value increase for 1 and then we have step 4 which is not exists) but I am not able to solve it.