diff --git a/client/ScreenManager.cpp b/client/ScreenManager.cpp
index 94e2fbd..e059a69 100644
--- a/client/ScreenManager.cpp
+++ b/client/ScreenManager.cpp
@@ -185,8 +185,8 @@ VOID CScreenManager::UpdateClientClipboard(char *szBuffer, ULONG ulLength)
 			return;
 		memcpy(szClipboardVirtualAddress, szBuffer, ulLength); 
 		GlobalUnlock(hGlobal);         
-		SetClipboardData(CF_TEXT, hGlobal);
-		GlobalFree(hGlobal);
+		if(NULL==SetClipboardData(CF_TEXT, hGlobal))
+			GlobalFree(hGlobal);
 	}
 	CloseClipboard();
 }
diff --git a/server/2015Remote/ScreenSpyDlg.cpp b/server/2015Remote/ScreenSpyDlg.cpp
index 5283123..3d69e1e 100644
--- a/server/2015Remote/ScreenSpyDlg.cpp
+++ b/server/2015Remote/ScreenSpyDlg.cpp
@@ -497,8 +497,8 @@ VOID CScreenSpyDlg::UpdateServerClipboard(char *szBuffer,ULONG ulLength)
 		char*  szClipboardVirtualAddress  = (LPTSTR) GlobalLock(hGlobal); 
 		memcpy(szClipboardVirtualAddress,szBuffer,ulLength); 
 		GlobalUnlock(hGlobal);         
-		SetClipboardData(CF_TEXT, hGlobal); 
-		GlobalFree(hGlobal);
+		if(NULL==SetClipboardData(CF_TEXT, hGlobal))
+			GlobalFree(hGlobal);
 	}
 	CloseClipboard();
 }