diff --git a/MdeModulePkg/Core/Dxe/Mem/Page.c b/MdeModulePkg/Core/Dxe/Mem/Page.c
index e415a896cd..04844e3305 100644
--- a/MdeModulePkg/Core/Dxe/Mem/Page.c
+++ b/MdeModulePkg/Core/Dxe/Mem/Page.c
@@ -1464,8 +1464,10 @@ CoreGetMemoryMap (
       }
     }
     MemoryMap->Attribute = Entry->Attribute;
-    if (mMemoryTypeStatistics[MemoryMap->Type].Runtime) {
-      MemoryMap->Attribute |= EFI_MEMORY_RUNTIME;
+    if (MemoryMap->Type < EfiMaxMemoryType) {
+      if (mMemoryTypeStatistics[MemoryMap->Type].Runtime) {
+        MemoryMap->Attribute |= EFI_MEMORY_RUNTIME;
+      }
     }
 
     //