diff --git a/erpnext/controllers/queries.py b/erpnext/controllers/queries.py
index 37afed7..353721e 100644
--- a/erpnext/controllers/queries.py
+++ b/erpnext/controllers/queries.py
@@ -185,7 +185,7 @@
 				"page_len": page_len
 			}, as_dict=as_dict)
 
-def bom(doctype, txt, searchfield, filters, start=0, page_len=20):
+def bom(doctype, txt, searchfield, start, page_len, filters):
 	conditions = []
 
 	return frappe.db.sql("""select tabBOM.name, tabBOM.item
@@ -204,8 +204,8 @@
 		{
 			'txt': "%%%s%%" % frappe.db.escape(txt),
 			'_txt': txt.replace("%", ""),
-			'start': start,
-			'page_len': page_len
+			'start': start or 0,
+			'page_len': page_len or 20
 		})
 
 def get_project_name(doctype, txt, searchfield, start, page_len, filters):