Json str error when reopen the closed tab

Code:
{ route: "/s/login", mauticContent: "user", sessionExpired: true, flashes: "", notifications: { content: "", lastId: null, hasNewNotifications: false, updateAvailable: false }, browserNotifications: [ ], newContent: "

{ route: "/s/login", mauticContent: "user", sessionExpired: true, flashes: "", notifications: { content: "", lastId: null, hasNewNotifications: false, updateAvailable: false }, browserNotifications: [ ], newContent: " <div class="content-body"> <div class="page-header"> <div class="box-layout"> <div class="col-xs-5 col-sm-6 col-md-5 va-m">

?? What tab ?? Steps to reproduce ??

@escopecz
In chrome, close the login page(/s/login) and reopen(ctrl+shift+t) the closed page, sometimes it will show the error string!

Thanks for the explanation! I tried several times, but cannot replicate. Is there anything specific I have to do? Or OS/Chrome version?

@escopecz My OS is win10 pro, and Chrome version is 51.0.2704.106 m!
The error keyword is mautic.user.auth.expired.header