diff --git a/erpnext/portal/utils.py b/erpnext/portal/utils.py
index 7dffd03..8115c1f 100644
--- a/erpnext/portal/utils.py
+++ b/erpnext/portal/utils.py
@@ -4,14 +4,17 @@
 	'''Set customer, supplier, student based on email'''
 	if frappe.flags.setting_role or frappe.flags.in_migrate:
 		return
+
+	roles = frappe.get_roles(doc.name)
+
 	contact_name = frappe.get_value('Contact', dict(email_id=doc.email))
 	if contact_name:
 		contact = frappe.get_doc('Contact', contact_name)
 		for link in contact.links:
 			frappe.flags.setting_role = True
-			if link.link_doctype=='Customer':
+			if link.link_doctype=='Customer' and 'Customer' not in roles:
 				doc.add_roles('Customer')
-			elif link.link_doctype=='Supplier':
+			elif link.link_doctype=='Supplier' and 'Supplier' not in roles:
 				doc.add_roles('Supplier')
-	elif frappe.get_value('Student', dict(student_email_id=doc.email)):
+	elif frappe.get_value('Student', dict(student_email_id=doc.email)) and 'Student' not in roles:
 		doc.add_roles('Student')