diff --git a/dlls/xactengine3_7/tests/xact3.c b/dlls/xactengine3_7/tests/xact3.c
index 6b66af59ff0..2a97f5f7c5c 100644
--- a/dlls/xactengine3_7/tests/xact3.c
+++ b/dlls/xactengine3_7/tests/xact3.c
@@ -208,6 +208,24 @@ static void test_notifications(void)
     hr = IXACT3Engine_Initialize(engine, &params);
     ok(hr == S_OK, "Cannot initialize engine, hr %#lx\n", hr);
 
+    notification_desc.type = 0;
+    notification_desc.flags = 0;
+    notification_desc.pvContext = &prepared_data;
+    hr = IXACT3Engine_RegisterNotification(engine, &notification_desc);
+    ok(hr == E_INVALIDARG, "got hr %#lx\n", hr);
+
+    hr = IXACT3Engine_UnRegisterNotification(engine, &notification_desc);
+    ok(hr == S_OK, "got hr %#lx\n", hr);
+
+    notification_desc.type = XACTNOTIFICATIONTYPE_WAVEBANKSTREAMING_INVALIDCONTENT + 1;
+    notification_desc.flags = 0;
+    notification_desc.pvContext = &prepared_data;
+    hr = IXACT3Engine_RegisterNotification(engine, &notification_desc);
+    ok(hr == E_INVALIDARG, "got hr %#lx\n", hr);
+
+    hr = IXACT3Engine_UnRegisterNotification(engine, &notification_desc);
+    ok(hr == S_OK, "got hr %#lx\n", hr);
+
     prepared_data.type = XACTNOTIFICATIONTYPE_WAVEBANKPREPARED;
     prepared_data.thread_id = GetCurrentThreadId();
     notification_desc.type = XACTNOTIFICATIONTYPE_WAVEBANKPREPARED;
diff --git a/dlls/xactengine3_7/xact_dll.c b/dlls/xactengine3_7/xact_dll.c
index cd72f43949f..f2737e0a9bd 100644
--- a/dlls/xactengine3_7/xact_dll.c
+++ b/dlls/xactengine3_7/xact_dll.c
@@ -1517,6 +1517,10 @@ static HRESULT WINAPI IXACT3EngineImpl_RegisterNotification(IXACT3Engine *iface,
 
     TRACE("(%p)->(%p)\n", This, pNotificationDesc);
 
+    if (pNotificationDesc->type < XACTNOTIFICATIONTYPE_CUEPREPARED ||
+        pNotificationDesc->type > XACTNOTIFICATIONTYPE_WAVEBANKSTREAMING_INVALIDCONTENT)
+        return E_INVALIDARG;
+
     unwrap_notificationdesc(&fdesc, pNotificationDesc);
     This->contexts[pNotificationDesc->type] = pNotificationDesc->pvContext;
     fdesc.pvContext = This;
@@ -1531,6 +1535,10 @@ static HRESULT WINAPI IXACT3EngineImpl_UnRegisterNotification(IXACT3Engine *ifac
 
     TRACE("(%p)->(%p)\n", This, pNotificationDesc);
 
+    if (pNotificationDesc->type < XACTNOTIFICATIONTYPE_CUEPREPARED ||
+        pNotificationDesc->type > XACTNOTIFICATIONTYPE_WAVEBANKSTREAMING_INVALIDCONTENT)
+        return S_OK;
+
     unwrap_notificationdesc(&fdesc, pNotificationDesc);
     fdesc.pvContext = This;
     return FACTAudioEngine_UnRegisterNotification(This->fact_engine, &fdesc);