diff --git a/erpnext/accounts/report/gross_and_net_profit_report/gross_and_net_profit_report.py b/erpnext/accounts/report/gross_and_net_profit_report/gross_and_net_profit_report.py
index 604bc01..a52aaff 100644
--- a/erpnext/accounts/report/gross_and_net_profit_report/gross_and_net_profit_report.py
+++ b/erpnext/accounts/report/gross_and_net_profit_report/gross_and_net_profit_report.py
@@ -134,7 +134,7 @@
 
 def remove_parent_with_no_child(data):
 	data_to_be_removed = False
-	for parent in data:
+	for parent in list(data):
 		if "is_group" in parent and parent.get("is_group") == 1:
 			have_child = False
 			for child in data: