diff --git a/bin/billing_monthly_cronjob b/bin/billing_monthly_cronjob
index cf36660b98b7d6f4169ff398a57e9393fdb6db89..83169f6c41b99200ba4e1312eb0e1df6390b2a38 100755
--- a/bin/billing_monthly_cronjob
+++ b/bin/billing_monthly_cronjob
@@ -179,8 +179,8 @@ end
 db.transaction do
 	db.exec(
 		<<-SQL
-		SELECT customer_id, plan_name, expires_at, balance
-		FROM customer_plans INNER JOIN balances USING (customer_id)
+		SELECT customer_id, plan_name, expires_at, COALESCE(balance, 0) AS balance
+		FROM customer_plans LEFT JOIN balances USING (customer_id)
 		WHERE expires_at <= NOW()
 		SQL
 	).each do |row|