diff --git a/app/Domains/Virtual/Commands/Sync/FlowPoolSync.php b/app/Domains/Virtual/Commands/Sync/FlowPoolSync.php
index 7a131ce2..b8bc2563 100644
--- a/app/Domains/Virtual/Commands/Sync/FlowPoolSync.php
+++ b/app/Domains/Virtual/Commands/Sync/FlowPoolSync.php
@@ -66,9 +66,9 @@ class FlowPoolSync extends Command
 
             $settings =  $oldFlowPoolSettings[$value['dp_sn']];
 
-            $settings = array_sort($settings, function ($item) {
+            $settings = array_values(array_sort($settings, function ($item) {
                 return $item['year_month'];
-            });
+            }));
 
             foreach ($settings as $i => $item) {
                 $dp_billing_rules = json_decode($item['dp_billing_rules'], true);