diff --git a/lib/customer_plan.rb b/lib/customer_plan.rb
index f4716a3bbd27e24c25501ab59740e5f7a58ce84f..b7cb59dd4942d86af9a268825f0596f75412e60b 100644
--- a/lib/customer_plan.rb
+++ b/lib/customer_plan.rb
@@ -70,7 +70,7 @@ class CustomerPlan
 	end
 
 	def bill_plan(note: nil)
-		EM.promise_fiber do
+		EMPromise.resolve(nil).then do
 			DB.transaction do |db|
 				next false unless !block_given? || yield(db)