diff --git a/drivers/network/afd/afd/tdi.c b/drivers/network/afd/afd/tdi.c
index 8539f9560a8..73a077c8188 100644
--- a/drivers/network/afd/afd/tdi.c
+++ b/drivers/network/afd/afd/tdi.c
@@ -399,6 +399,8 @@ NTSTATUS TdiListen
 
   AFD_DbgPrint(MAX_TRACE, ("Called\n"));
 
+  assert(ConnectionObject);
+
   DeviceObject = IoGetRelatedDeviceObject(ConnectionObject);
   if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -525,6 +527,8 @@ NTSTATUS TdiQueryDeviceControl(
     KEVENT Event;
     PIRP Irp;
 
+    assert(FileObject);
+
     DeviceObject = IoGetRelatedDeviceObject(FileObject);
     if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -574,6 +578,8 @@ NTSTATUS TdiQueryInformation(
     KEVENT Event;
     PIRP Irp;
 
+    assert(FileObject);
+
     DeviceObject = IoGetRelatedDeviceObject(FileObject);
     if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -797,6 +803,8 @@ NTSTATUS TdiSend
     NTSTATUS Status = STATUS_SUCCESS;
     PMDL Mdl;
 
+    assert(TransportObject);
+
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
     if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -877,6 +885,8 @@ NTSTATUS TdiReceive(
     PDEVICE_OBJECT DeviceObject;
     PMDL Mdl;
 
+    assert(TransportObject);
+
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
     if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -976,6 +986,8 @@ NTSTATUS TdiReceiveDatagram(
     NTSTATUS Status;
     PMDL Mdl;
 
+    assert(TransportObject);
+
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
     if (!DeviceObject) {
         AFD_DbgPrint(MIN_TRACE, ("Bad device object.\n"));
@@ -1065,6 +1077,8 @@ NTSTATUS TdiSendDatagram(
     NTSTATUS Status;
     PMDL Mdl;
 
+    assert(TransportObject);
+
     AFD_DbgPrint(MID_TRACE,("Called(TransportObject %x)\n", TransportObject));
 
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
@@ -1145,6 +1159,8 @@ NTSTATUS TdiDisconnect(
 
     KeInitializeEvent(&Event, NotificationEvent, FALSE);
 
+    assert(TransportObject);
+
     AFD_DbgPrint(MID_TRACE,("Called(TransportObject %x)\n", TransportObject));
 
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);