diff --git a/frappe/desk/doctype/dashboard/dashboard.py b/frappe/desk/doctype/dashboard/dashboard.py
index 621ab19ecd..af0c48d9c6 100644
--- a/frappe/desk/doctype/dashboard/dashboard.py
+++ b/frappe/desk/doctype/dashboard/dashboard.py
@@ -23,7 +23,7 @@ class Dashboard(Document):
 			try:
 				json.loads(self.chart_options)
 			except ValueError as error:
-				frappe.throw(_("Invalid json added in the custom options: %s" % error))
+				frappe.throw(_("Invalid json added in the custom options: {0}").format(error))
 
 @frappe.whitelist()
 def get_permitted_charts(dashboard_name):