diff --git a/Samples/Win7Samples/multimedia/directshow/capture/amcap/amcap.cpp b/Samples/Win7Samples/multimedia/directshow/capture/amcap/amcap.cpp
index 54407864..dbfc60c6 100644
--- a/Samples/Win7Samples/multimedia/directshow/capture/amcap/amcap.cpp
+++ b/Samples/Win7Samples/multimedia/directshow/capture/amcap/amcap.cpp
@@ -2661,7 +2661,7 @@ void ChooseDevices(IMoniker *pmVideo, IMoniker *pmAudio)
             break;
 
         CheckMenuItem(GetMenu(ghwndApp), MENU_ADEVICE0 + i,
-            (S_OK == gcap.rgpmAudioMenu[i]->IsEqual(gcap.pmAudio)) ? MF_CHECKED : MF_UNCHECKED);
+            (gcap.pmAudio && S_OK == gcap.rgpmAudioMenu[i]->IsEqual(gcap.pmAudio)) ? MF_CHECKED : MF_UNCHECKED);
     }
 
     // Put the video driver name in the status bar - if the filter supports