diff --git a/modules/sane_user/HGSaneImpl.cpp b/modules/sane_user/HGSaneImpl.cpp
index 3a5a4c0a..7de1bb5e 100644
--- a/modules/sane_user/HGSaneImpl.cpp
+++ b/modules/sane_user/HGSaneImpl.cpp
@@ -162,7 +162,7 @@ HGResult HGSaneManagerImpl::OpenSource(HGUInt index, class HGSaneSourceImpl **so
 
 HGResult HGSaneManagerImpl::OpenDefaultSource(HGSaneSourceImpl **sourceImpl)
 {
-    if (NULL == sourceImpl)
+    if (m_vSource.empty() || NULL == sourceImpl)
     {
         return HGBASE_ERR_INVALIDARG;
     }