diff --git a/dlls/atl/atl_main.c b/dlls/atl/atl_main.c
index 4c496980f3d..e8f1c45f26e 100644
--- a/dlls/atl/atl_main.c
+++ b/dlls/atl/atl_main.c
@@ -128,7 +128,7 @@ HRESULT WINAPI AtlInternalQueryInterface(LPVOID this, const _ATL_INTMAP_ENTRY* p
         TRACE("Trying entry %i (%p %li %p)\n",i,pEntries[i].piid,
               pEntries[i].dw, pEntries[i].pFunc);
 
-        if (IsEqualGUID(iid,pEntries[i].piid))
+        if (pEntries[i].piid && IsEqualGUID(iid,pEntries[i].piid))
         {
             TRACE("MATCH\n");
             if (pEntries[i].pFunc == (_ATL_CREATORARGFUNC*)1)