diff --git a/SicRT/Equipments/AutoTransfer.cs b/SicRT/Equipments/AutoTransfer.cs
index 7ecf07ad..a7a4684f 100644
--- a/SicRT/Equipments/AutoTransfer.cs
+++ b/SicRT/Equipments/AutoTransfer.cs
@@ -3221,7 +3221,10 @@ namespace SicRT.Modules
         private bool CheckHasTrayAndNoWaferByModule(ModuleName moduleName, int slot,ModuleName pmModule)
         {
             var module = GetModule(moduleName);
+            if (module is null  || !module.IsAvailable)
+                return false;
 
+            
             if((module.GetWaferInfo(slot).TrayOriginSlot % 2 == 0 && pmModule == ModuleName.PM1)
                 || (module.GetWaferInfo(slot).TrayOriginSlot % 2 == 1 && pmModule == ModuleName.PM2))
             {
diff --git a/SicRT/Equipments/Schedulers/SchedulerModule.cs b/SicRT/Equipments/Schedulers/SchedulerModule.cs
index 643c88eb..370d3712 100644
--- a/SicRT/Equipments/Schedulers/SchedulerModule.cs
+++ b/SicRT/Equipments/Schedulers/SchedulerModule.cs
@@ -2,6 +2,7 @@
 using Aitex.Core.Common;
 using Aitex.Core.RT.Event;
 using Aitex.Core.Util;
+using DocumentFormat.OpenXml.Wordprocessing;
 using MECF.Framework.Common.Equipment;
 using MECF.Framework.Common.Schedulers;
 using MECF.Framework.Common.SubstrateTrackings;
@@ -280,6 +281,8 @@ namespace SicRT.Modules.Schedulers
         public bool HasTrayAndNotExceedProcessCount(int slot)
         {
             var wi = WaferManager.Instance.GetWafer(ModuleHelper.Converter(_module), slot);
+            if (wi is null)
+                return false;
             return wi.TrayState == WaferTrayStatus.Normal && wi.TrayProcessCount >0;
         }
 
diff --git a/SicSimulator/Instances/SimulatorSystem.cs b/SicSimulator/Instances/SimulatorSystem.cs
index c64b04f0..032a0a0e 100644
--- a/SicSimulator/Instances/SimulatorSystem.cs
+++ b/SicSimulator/Instances/SimulatorSystem.cs
@@ -90,9 +90,9 @@ namespace SicSimulator.Instances
             IO.DI["DI_BufferStationLidClosed"].Value = true;
             IO.DI["DI_UnloadStationLidClosed"].Value = true;
 
-            IO.DI["DI_WaferCassetLeftInch6"].Value = true;
-            IO.DI["DI_WaferCassetRightInch6"].Value = true;
-            IO.DI["DI_TrayCassetInch6"].Value = true;
+            IO.DI["DI_WaferCassetLeftInch8"].Value = true;
+            IO.DI["DI_WaferCassetRightInch8"].Value = true;
+            IO.DI["DI_TrayCassetInch8"].Value = true;
 
             IO.DI["DI_LdRotationBusy"].Value = false;