Email Send Error for CC field

From Lead doctype, I am sending email, if I put any user into cc then I am getting error but without cc it is working. Following is error

Traceback (most recent call last):
File “apps/frappe/frappe/app.py”, line 68, in application
response = frappe.api.handle()
File “apps/frappe/frappe/api.py”, line 55, in handle
return frappe.handler.handle()
File “apps/frappe/frappe/handler.py”, line 31, in handle
data = execute_cmd(cmd)
File “apps/frappe/frappe/handler.py”, line 68, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “apps/frappe/frappe/init.py”, line 1213, in call
return fn(*args, **newargs)
File “apps/frappe/frappe/core/doctype/communication/email.py”, line 58, in make
comm = frappe.get_doc({
File “apps/frappe/frappe/model/document.py”, line 240, in insert
self.run_before_save_methods()
File “apps/frappe/frappe/model/document.py”, line 971, in run_before_save_methods
self.run_method(“validate”)
File “apps/frappe/frappe/model/document.py”, line 869, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “apps/frappe/frappe/model/document.py”, line 1161, in composer
return composed(self, method, *args, **kwargs)
File “apps/frappe/frappe/model/document.py”, line 1144, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “apps/frappe/frappe/model/document.py”, line 863, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “apps/frappe/frappe/core/doctype/communication/communication.py”, line 66, in validate
self.set_timeline_links()
File “apps/frappe/frappe/core/doctype/communication/communication.py”, line 263, in set_timeline_links
contacts = get_contacts([self.sender, self.recipients, self.cc, self.bcc], auto_create_contact=create_contact_enabled)
File “apps/frappe/frappe/core/doctype/communication/communication.py”, line 353, in get_contacts
email = get_email_without_link(email)
File “apps/frappe/frappe/core/doctype/communication/communication.py”, line 425, in get_email_without_link
email_host = email.split("@")[1]
IndexError: list index out of range