diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index 78aeee7..a1fba07 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -11,7 +11,7 @@
 	if not hasattr(doc, 'gstin'):
 		return
 
-	doc.gstin = doc.gstin.upper().strip()
+	doc.gstin = doc.gstin.upper().strip() if doc.gstin else ""
 	if not doc.gstin or doc.gstin == 'NA':
 		return