diff --git a/accounts/doctype/sales_invoice/sales_invoice.py b/accounts/doctype/sales_invoice/sales_invoice.py
index ebc6dd3..486bc0a 100644
--- a/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/accounts/doctype/sales_invoice/sales_invoice.py
@@ -322,8 +322,9 @@
 
 	
 	def pull_project_customer(self):
-		res = webnotes.conn.sql("select customer from `tabProject` where name = '%s'"%self.doc.project_name)
-		if res:
+		res = webnotes.conn.sql("select customer from `tabProject` where name = '%s'" %
+		 	self.doc.project_name)
+		if res and res[0][0]:
 			get_obj('DocType Mapper', 'Project-Sales Invoice').dt_map('Project', 'Sales Invoice', self.doc.project_name, self.doc, self.doclist, "[['Project', 'Sales Invoice']]")
 
 	def get_company_abbr(self):
diff --git a/stock/doctype/delivery_note/delivery_note.py b/stock/doctype/delivery_note/delivery_note.py
index ece9936..ef22437 100644
--- a/stock/doctype/delivery_note/delivery_note.py
+++ b/stock/doctype/delivery_note/delivery_note.py
@@ -80,8 +80,8 @@
 
 
 	def pull_project_customer(self):
-		res = sql("select customer from `tabProject` where name = '%s'"%self.doc.project_name)
-		if res:
+		res = sql("select customer from `tabProject` where name = '%s'" % self.doc.project_name)
+		if res and res[0][0]:
 			get_obj('DocType Mapper', 'Project-Delivery Note').dt_map('Project', 'Delivery Note', self.doc.project_name, self.doc, self.doclist, "[['Project', 'Delivery Note']]")