diff --git a/erpnext/crm/doctype/lead/lead.py b/erpnext/crm/doctype/lead/lead.py
index c0ce6ba..cad17a3 100644
--- a/erpnext/crm/doctype/lead/lead.py
+++ b/erpnext/crm/doctype/lead/lead.py
@@ -36,7 +36,8 @@
 		})
 
 	def set_full_name(self):
-		self.lead_name = " ".join(filter(None, [self.first_name, self.middle_name, self.last_name]))
+		if self.first_name:
+			self.lead_name = " ".join(filter(None, [self.first_name, self.middle_name, self.last_name]))
 
 	def validate_email_id(self):
 		if self.email_id: