diff --git a/checkin_notes b/checkin_notes
index 18e9f1cbab..ac3d0d2112 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -6162,3 +6162,4 @@ Charlie 30 July 2008
         sg_BoincSimpleGUI.cpp
         BOINCBaseFrame.cpp
         BOINCGUIApp.h
+        BOINCDialupManager.cpp
diff --git a/clientgui/BOINCDialupManager.cpp b/clientgui/BOINCDialupManager.cpp
index 5bf4018759..e641b0f0a8 100644
--- a/clientgui/BOINCDialupManager.cpp
+++ b/clientgui/BOINCDialupManager.cpp
@@ -108,7 +108,7 @@ void CBOINCDialUpManager::OnPoll() {
 
 
     // We are ready to rock and roll.
-    if (!bAlreadyRunningLoop && pDoc) {
+    if (!bAlreadyRunningLoop && pDoc && pFrame) {
         wxASSERT(wxDynamicCast(pDoc, CMainDocument));
         wxASSERT(wxDynamicCast(pFrame, CBOINCBaseFrame));
 #if defined(__WXMSW__)