diff --git a/webnotes/widgets/reportview.py b/webnotes/widgets/reportview.py
index 8b35e0d6b0..e99d6d3972 100644
--- a/webnotes/widgets/reportview.py
+++ b/webnotes/widgets/reportview.py
@@ -172,6 +172,8 @@ def build_conditions(doctype, fields, filters, docstatus):
 def build_filter_conditions(filters, conditions):
 	"""build conditions from user filters"""
 	from webnotes.utils import cstr
+	global tables
+	if not tables: tables = []
 	
 	for f in filters:
 		tname = ('`tab' + f[0] + '`')
@@ -179,7 +181,7 @@ def build_filter_conditions(filters, conditions):
 			tables.append(tname)
 		
 		# prepare in condition
-		if f[2]=='in':
+		if f[2] in ['in', 'not in']:
 			opts = ["'" + t.strip().replace("'", "\\'") + "'" for t in f[3].split(',')]
 			f[3] = "(" + ', '.join(opts) + ")"
 			conditions.append(tname + '.' + f[1] + " " + f[2] + " " + f[3])