diff --git a/MdeModulePkg/Core/Dxe/Misc/PropertiesTable.c b/MdeModulePkg/Core/Dxe/Misc/PropertiesTable.c
index ebe70966db..32497c1c0c 100644
--- a/MdeModulePkg/Core/Dxe/Misc/PropertiesTable.c
+++ b/MdeModulePkg/Core/Dxe/Misc/PropertiesTable.c
@@ -790,6 +790,7 @@ CoreGetMemoryMapPropertiesTable (
   if (Status == EFI_BUFFER_TOO_SMALL) {
     *MemoryMapSize = *MemoryMapSize + (*DescriptorSize) * AdditionalRecordCount;
   } else if (Status == EFI_SUCCESS) {
+    ASSERT (MemoryMap != NULL);
     if (OldMemoryMapSize - *MemoryMapSize < (*DescriptorSize) * AdditionalRecordCount) {
       *MemoryMapSize = *MemoryMapSize + (*DescriptorSize) * AdditionalRecordCount;
       //