diff --git a/reactos/dll/directx/dsound_new/classfactory.c b/reactos/dll/directx/dsound_new/classfactory.c
index ee31e6154cd..64d2f8f6192 100644
--- a/reactos/dll/directx/dsound_new/classfactory.c
+++ b/reactos/dll/directx/dsound_new/classfactory.c
@@ -86,6 +86,9 @@ IClassFactory_fnCreateInstance(
 {
     IClassFactoryImpl *This = (IClassFactoryImpl *)iface;
 
+    if (!ppvObject)
+        return E_INVALIDARG;
+
     *ppvObject = NULL;
 
     if ( This->riidInst==NULL || IsEqualCLSID(riid, This->riidInst) || IsEqualCLSID(riid, &IID_IUnknown) )
diff --git a/reactos/dll/directx/dsound_new/directsound.c b/reactos/dll/directx/dsound_new/directsound.c
index 12b03cf024c..754f56b0028 100644
--- a/reactos/dll/directx/dsound_new/directsound.c
+++ b/reactos/dll/directx/dsound_new/directsound.c
@@ -442,6 +442,13 @@ NewDirectSound(
     LPOLESTR pStr;
     LPCDirectSoundImpl This;
 
+    /* check param */
+    if (!ppvObject)
+    {
+        /* invalid param */
+        return E_INVALIDARG;
+    }
+
     /* check requested interface */
     if (!IsEqualIID(riid, &IID_IUnknown) && !IsEqualIID(riid, &IID_IDirectSound) && !IsEqualIID(riid, &IID_IDirectSound8))
     {
diff --git a/reactos/dll/directx/dsound_new/dsound.c b/reactos/dll/directx/dsound_new/dsound.c
index e8322ebbc31..c88fc00e528 100644
--- a/reactos/dll/directx/dsound_new/dsound.c
+++ b/reactos/dll/directx/dsound_new/dsound.c
@@ -124,8 +124,7 @@ WINAPI
 DllGetClassObject(
   REFCLSID rclsid,
   REFIID riid,
-  LPVOID* ppv 
-)
+  LPVOID* ppv)
 {
     LPOLESTR pStr, pStr2;
     UINT i;
@@ -153,7 +152,7 @@ DllGetClassObject(
         DPRINT("No Class Available for %ws IID %ws\n", pStr, pStr2);
         CoTaskMemFree(pStr);
         CoTaskMemFree(pStr2);
-        ASSERT(0);
+        //ASSERT(0);
         return CLASS_E_CLASSNOTAVAILABLE;
     }