diff --git a/libfreerdp/codec/h264.c b/libfreerdp/codec/h264.c
index 77773102a..357465d8f 100644
--- a/libfreerdp/codec/h264.c
+++ b/libfreerdp/codec/h264.c
@@ -468,7 +468,7 @@ BOOL h264_context_init(H264_CONTEXT* h264)
 	for (i = 0; i < MAX_SUBSYSTEMS; i++)
 	{
 		H264_CONTEXT_SUBSYSTEM* subsystem = subSystems[i];
-		if (!subsystem->Init)
+		if (!subsystem || !subsystem->Init)
 			break;
 
 		if (subsystem->Init(h264))
diff --git a/libfreerdp/codec/h264_mf.c b/libfreerdp/codec/h264_mf.c
index 7037ca75a..69a149b42 100644
--- a/libfreerdp/codec/h264_mf.c
+++ b/libfreerdp/codec/h264_mf.c
@@ -517,10 +517,12 @@ static BOOL mf_init(H264_CONTEXT* h264)
 	                         "MFCreateMediaType");
 	sys->MFCreateDXGIDeviceManager = (pfnMFCreateDXGIDeviceManager) GetProcAddress(
 	                                     sys->mfplat, "MFCreateDXGIDeviceManager");
-
+	/**
+	 * Note: MFCreateDXGIDeviceManager is supported starting from Windows 8.
+	 *       Don't fail below if GetProcAddress returned NULL.
+	 */
 	if (!sys->MFStartup || !sys->MFShutdown || !sys->MFCreateSample
-	    || !sys->MFCreateMemoryBuffer ||
-	    !sys->MFCreateMediaType || !sys->MFCreateDXGIDeviceManager)
+	    || !sys->MFCreateMemoryBuffer || !sys->MFCreateMediaType)
 		goto error;
 
 	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);