diff --git a/Source/GmmLib/ULT/GmmMultiAdapterULT.cpp b/Source/GmmLib/ULT/GmmMultiAdapterULT.cpp
index 443a3a4..39d2b4c 100644
--- a/Source/GmmLib/ULT/GmmMultiAdapterULT.cpp
+++ b/Source/GmmLib/ULT/GmmMultiAdapterULT.cpp
@@ -133,6 +133,7 @@ void MACommonULT::UnLoadGmmDll(uint32_t AdapterIdx, uint32_t CountIdx)
 
 void MACommonULT::GmmInitModule(uint32_t AdapterIdx, uint32_t CountIdx)
 {
+    ASSERT_TRUE(AdapterIdx < MAX_NUM_ADAPTERS);
     GMM_STATUS  Status                                  = GMM_SUCCESS;
     ADAPTER_BDF AdapterBDF                              = GetAdapterBDF(AdapterIdx);
     GfxPlatform[AdapterIdx][CountIdx].eProductFamily    = GetProductFamily(AdapterIdx);