Back Button Problem in SharePoint Client Web part Iframe (SharePoint hosted app)

Hi All,

I am facing one issue in SharePoint hosted app, i have created a client web part and using SP hosted app in iframe in one of the page in SP site, but when i open that page from outlook (by clicking link), the back button is automatically enabled with one page in its history named as "Working on it" page, so if a user clicks on back button then user will be landed on "Working on it" page which is not correct, but when i open it using my bookmarks or copy pasting the url in new tab then its working fine, please let me know any solution for this.