diff --git a/App/SicUI/Models/PMs/PMOperationViewModel.cs b/App/SicUI/Models/PMs/PMOperationViewModel.cs
index 9eeaf0d..6901d5d 100644
--- a/App/SicUI/Models/PMs/PMOperationViewModel.cs
+++ b/App/SicUI/Models/PMs/PMOperationViewModel.cs
@@ -1157,7 +1157,12 @@ namespace SicUI.Models.PMs
 
         private void GetSC()
         {
-            Mfc5IsInstalled = (bool)QueryDataClient.Instance.Service.GetConfig($"PM.{Module}.MFC.Mfc5.IsInstalled");
+            var mfc5IsInstalled = QueryDataClient.Instance.Service.GetConfig($"PM.{Module}.MFC.Mfc5.IsInstalled");
+            if (mfc5IsInstalled != null)
+            {
+                Mfc5IsInstalled = (bool)QueryDataClient.Instance.Service.GetConfig($"PM.{Module}.MFC.Mfc5.IsInstalled");
+            }
+            
             TMAEnable = (bool)QueryDataClient.Instance.Service.GetConfig($"PM.{Module}.TMAEnable");
             CarbonSource = (string)QueryDataClient.Instance.Service.GetConfig($"PM.{Module}.CarbonSource");