diff --git a/reactos/drivers/wdm/audio/legacy/stream/pnp.c b/reactos/drivers/wdm/audio/legacy/stream/pnp.c
index b21d4384d4e..37c5a75caf2 100644
--- a/reactos/drivers/wdm/audio/legacy/stream/pnp.c
+++ b/reactos/drivers/wdm/audio/legacy/stream/pnp.c
@@ -157,6 +157,10 @@ StreamClassStartDevice(
     /* Get driver object extension */
     DriverObjectExtension = IoGetDriverObjectExtension(DeviceObject->DriverObject, (PVOID)StreamClassAddDevice);
 
+    /* sanity checks */
+    ASSERT(DeviceExtension);
+    ASSERT(DriverObjectExtension);
+
     /* Zero request block */
     RtlZeroMemory(RequestBlock, ResultLength);