I preface my answer by stating that I am not a physician. That said, I understand that peanut butter is actually recommended on occasions as a protein substitute for those suffering from gout.
Although diet does play a role in the onset or reoccurence of gout, genetics tends to be the dominant factor. I know, there is not much that we can do about our genetic predisposition, so sticking to the topic of foods, meat, seafood, especially shellfish, and alcohol tend be the substances which contribute to high levels of uric acid in your system, and therefore gout.
You seem to be safe with peanut butter.