diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
index ef72b9b45d..94e5ab2c0e 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
@@ -226,12 +226,14 @@ SetProcessorRegister (
   CPU_REGISTER_TABLE        *RegisterTable;
 
   InitApicId = GetInitialApicId ();
+  RegisterTable = NULL;
   for (Index = 0; Index < RegisterTableCount; Index++) {
     if (RegisterTables[Index].InitialApicId == InitApicId) {
       RegisterTable =  &RegisterTables[Index];
       break;
     }
   }
+  ASSERT (RegisterTable != NULL);
 
   //
   // Traverse Register Table of this logical processor