diff --git a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
index 1788f8c..3b08931 100644
--- a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
+++ b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
@@ -67,7 +67,7 @@
 	if root_type in ('Asset', 'Liability', 'Equity'):
 		for i, r in enumerate(result):
 			if i > 0:
-				r[i][1] = r[i][1] + result[i-1][1]
+				r[1] = r[1] + result[i-1][1]
 
 	return result