Uncaught TypeError: Cannot read property 'id' of undefined

Odoo is the world's easiest all-in-one management software.
It includes hundreds of business apps:

e-Commerce

Accounting

Inventory

Project management

First i fetched all the mails from a mail id, that mail id is set for recruitment purpose. When i tried to delete a mail it shows below error

Uncaught TypeError: Cannot read property 'id' of undefined

http://ip:8069/web/webclient/js?mods=hr,web_process,web_calendar,base,web_tests,web_dashboard,hr_payroll,web_diagram,web_mobile,web_graph,web_kanban,hr_recruitment,hr_holidays,web_gantt,mail,crm:11614

How can i solve this?

Odoo is a suite of open source business apps that cover all your company needs: CRM, eCommerce, accounting, inventory, point of sale, project management, etc.

Odoo's unique value proposition is to be at the same time very easy to use and fully integrated.