diff --git a/modules/twain_user/HGTwainImpl.cpp b/modules/twain_user/HGTwainImpl.cpp
index 51a2a31a..68f472d9 100644
--- a/modules/twain_user/HGTwainImpl.cpp
+++ b/modules/twain_user/HGTwainImpl.cpp
@@ -610,11 +610,6 @@ HGResult HGTwainDSImpl::Enable(HGBool showUI, HWND parent, HGDSCloseReqFunc even
 		return HGTWAIN_ERR_FAIL;
 	}
 
-    if (!showUI)
-    {
-        HGBase_SetEvent(m_event);
-    }
-
 	m_showUI = showUI;
 	m_parent = parent;
 	m_eventFunc = eventFunc;
@@ -993,6 +988,7 @@ void HGAPI HGTwainDSImpl::ThreadFunc(HGThread thread, HGPointer param)
             }
         }
 
-        p->Disable();
+        if (!p->m_showUI)
+            p->Disable();
     }
 }