diff --git a/SicRT/Equipments/ManualAutoTransfer.cs b/SicRT/Equipments/ManualAutoTransfer.cs
index 314d239d..81ba5120 100644
--- a/SicRT/Equipments/ManualAutoTransfer.cs
+++ b/SicRT/Equipments/ManualAutoTransfer.cs
@@ -1333,25 +1333,25 @@ namespace SicRT.Modules
             if (_updateAutoJobLocation.Q)
             {
                 WaferInfoRt wafer = WaferManager.Instance.GetWafer(ModuleName.PM1, 0);
-                if (wafer != null)
+                if (wafer?.WaferID != null)
                 {
                     AutoJobRecorder.UpdatePosition(wafer.WaferID.ToString(), ModuleName.PM1.ToString(), GetWaferStatue(wafer));
                 }
 
                 WaferInfoRt wafer1 = WaferManager.Instance.GetWafer(ModuleName.TMRobot, 0);
-                if (wafer1 != null)
+                if (wafer1?.WaferID != null)
                 {
                     AutoJobRecorder.UpdatePosition(wafer1.WaferID.ToString(), ModuleName.TM.ToString(), GetWaferStatue(wafer1));
                 }
 
                 WaferInfoRt wafer2 = WaferManager.Instance.GetWafer(ModuleName.Buffer, 0);
-                if (wafer2 != null)
+                if (wafer2?.WaferID != null)
                 {
                     AutoJobRecorder.UpdatePosition(wafer2.WaferID.ToString(), ModuleName.Buffer.ToString(), GetWaferStatue(wafer2));
                 }
 
                 WaferInfoRt wafer3 = WaferManager.Instance.GetWafer(ModuleName.LoadLock, 0);
-                if (wafer3 != null)
+                if (wafer3?.WaferID != null)
                 {
                     AutoJobRecorder.UpdatePosition(wafer3.WaferID.ToString(), ModuleName.LoadLock.ToString(), GetWaferStatue(wafer3));
                 }