diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
index b30c9c48..e08fe863 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
@@ -223,13 +223,14 @@ public partial class CoreConfigSingboxService
                                 password = protocolExtra.SalamanderPass.TrimEx(),
                             };
                         }
-
-                        outbound.up_mbps = protocolExtra?.UpMbps is { } su and >= 0
+                        int? upMbps = protocolExtra?.UpMbps is { } su and >= 0
                             ? su
                             : _config.HysteriaItem.UpMbps;
-                        outbound.down_mbps = protocolExtra?.DownMbps is { } sd and >= 0
+                        int? downMbps = protocolExtra?.DownMbps is { } sd and >= 0
                             ? sd
-                            : _config.HysteriaItem.DownMbps;
+                            : _config.HysteriaItem.UpMbps;
+                        outbound.up_mbps = upMbps > 0 ? upMbps : null;
+                        outbound.down_mbps = downMbps > 0 ? downMbps : null;
                         var ports = protocolExtra?.Ports?.IsNullOrEmpty() == false ? protocolExtra.Ports : null;
                         if ((!ports.IsNullOrEmpty()) && (ports.Contains(':') || ports.Contains('-') || ports.Contains(',')))
                         {
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index ca58623a..bc2dd366 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -675,7 +675,7 @@ public partial class CoreConfigV2rayService
 
             if (!_node.Finalmask.IsNullOrEmpty())
             {
-                streamSettings.finalmask = JsonUtils.Deserialize<object>(_node.Finalmask);
+                streamSettings.finalmask = JsonUtils.ParseJson(_node.Finalmask);
             }
         }
         catch (Exception ex)