diff --git a/frappe/core/doctype/communication/mixins.py b/frappe/core/doctype/communication/mixins.py
index b48385ce49..5735895652 100644
--- a/frappe/core/doctype/communication/mixins.py
+++ b/frappe/core/doctype/communication/mixins.py
@@ -6,7 +6,7 @@ from frappe.desk.doctype.notification_settings.notification_settings import (
 )
 from frappe.desk.doctype.todo.todo import ToDo
 from frappe.email.doctype.email_account.email_account import EmailAccount
-from frappe.utils import get_formatted_email, get_url, parse_addr
+from frappe.utils import cstr, get_formatted_email, get_url, parse_addr
 
 
 class CommunicationEmailMixin:
@@ -147,7 +147,7 @@ class CommunicationEmailMixin:
 
 	def get_content(self, print_format=None):
 		if print_format and frappe.get_system_settings("attach_view_link"):
-			return self.content + self.get_attach_link(print_format)
+			return cstr(self.content) + self.get_attach_link(print_format)
 		return self.content
 
 	def get_attach_link(self, print_format):