diff --git a/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py b/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
index fea55a3..01f716d 100644
--- a/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
+++ b/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
@@ -34,8 +34,9 @@
 			frappe.throw(_("Customers not selected."))
 
 		if self.enable_auto_email:
-			self.to_date = self.start_date
-			self.from_date = add_months(self.to_date, -1 * self.filter_duration)
+			if self.start_date and getdate(self.start_date) >= getdate(today()):
+				self.to_date = self.start_date
+				self.from_date = add_months(self.to_date, -1 * self.filter_duration)
 
 
 def get_report_pdf(doc, consolidated=True):