diff --git a/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Builder - Rev E.pdf b/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Builder - Rev E.pdf
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diff --git a/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Loader - Rev D.pdf b/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Loader - Rev D.pdf
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diff --git a/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Packet - Rev C.pdf b/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Packet - Rev C.pdf
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diff --git a/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Software - Rev C.pdf b/ServiceFwUpdate/Documents/2023-11-23 Quick Reference Cordonel Service FW-Update Software - Rev C.pdf
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diff --git a/ServiceFwUpdate/Ui/ServiceFwUpdateSw/FrmServiceFwUpdateSw.cs b/ServiceFwUpdate/Ui/ServiceFwUpdateSw/FrmServiceFwUpdateSw.cs
index 6787421a..fd722ebd 100644
--- a/ServiceFwUpdate/Ui/ServiceFwUpdateSw/FrmServiceFwUpdateSw.cs
+++ b/ServiceFwUpdate/Ui/ServiceFwUpdateSw/FrmServiceFwUpdateSw.cs
@@ -4360,6 +4360,9 @@ namespace Xylem.ServiceFwUpdate.Ui.ServiceFwUpdateSw
         /// <remarks date="2023-Nov-22" author="Thomas Wiedebusch">
         /// - Taking meter response of invalid LUT file indicated by 0x8000xxxx.
         /// </remarks>
+        /// <remarks date="2023-Nov-27" author="Thomas Wiedebusch">
+        /// - Added check for string LutCrc is not null or empty.
+        /// </remarks>
         private void RestoreLutFile(ProcessState successExitState, ProcessState errorExitState = ProcessState.Error)
         {
             // Remind the invoker being able to generate error messages based on the last state
@@ -4368,7 +4371,7 @@ namespace Xylem.ServiceFwUpdate.Ui.ServiceFwUpdateSw
 
 
             // 1. LUT file is invalid indicated by CRC
-            if (_currentGenesis.LutCrc.Contains(MeterLutFile.StrLutFileInvalidCrc))
+            if (!string.IsNullOrEmpty(_currentGenesis.LutCrc) && _currentGenesis.LutCrc.Contains(MeterLutFile.StrLutFileInvalidCrc))
             {
                 InfoProcessFailed(lblLutFileCheck, Resources.StrLutFileNotInstalled);
                 _processState = errorExitState;