diff --git a/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c b/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
index 30a73fc04d..3a829854af 100644
--- a/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
+++ b/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
@@ -1110,7 +1110,9 @@ DumpGuardedMemoryBitmap (
   CHAR8     *Ruler1;
   CHAR8     *Ruler2;
 
-  if (mGuardedMemoryMap == 0) {
+  if (mGuardedMemoryMap == 0 ||
+      mMapLevel == 0 ||
+      mMapLevel > GUARDED_HEAP_MAP_TABLE_DEPTH) {
     return;
   }
 
diff --git a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
index 7dbbf79dc0..1d5fb8cdb5 100644
--- a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
+++ b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
@@ -1170,7 +1170,9 @@ SetAllGuardPages (
   UINTN     Index;
   BOOLEAN   OnGuarding;
 
-  if (mGuardedMemoryMap == 0) {
+  if (mGuardedMemoryMap == 0 ||
+      mMapLevel == 0 ||
+      mMapLevel > GUARDED_HEAP_MAP_TABLE_DEPTH) {
     return;
   }
 
@@ -1329,7 +1331,9 @@ DumpGuardedMemoryBitmap (
   CHAR8     *Ruler1;
   CHAR8     *Ruler2;
 
-  if (mGuardedMemoryMap == 0) {
+  if (mGuardedMemoryMap == 0 ||
+      mMapLevel == 0 ||
+      mMapLevel > GUARDED_HEAP_MAP_TABLE_DEPTH) {
     return;
   }