sessions.diff

-       simultaneous_sessions = frappe.db.get_value('User', user, 'simultaneous_sessions') or 1
+       limit = 0
+       if user==frappe.session.user:
+               # logging out self
+               # keep my other sessions active
+               simultaneous_sessions = frappe.db.get_value('User', user, 'simultaneous_sessions') or 1
+               limit = simultaneous_sessions - 1

        condition = ''
        if keep_current:
                condition = ' and sid != "{0}"'.format(frappe.session.sid)

-       limit = simultaneous_sessions - 1