diff --git a/codec/decoder/plus/src/welsDecoderExt.cpp b/codec/decoder/plus/src/welsDecoderExt.cpp
index edbf058d..bc61a950 100644
--- a/codec/decoder/plus/src/welsDecoderExt.cpp
+++ b/codec/decoder/plus/src/welsDecoderExt.cpp
@@ -285,6 +285,12 @@ long CWelsDecoder::SetOption (DECODER_OPTION eOptID, void* pOption) {
     iVal	= * ((int*)pOption);	// int value for error concealment idc
     iVal = WELS_CLIP3 (iVal, (int32_t) ERROR_CON_DISABLE, (int32_t) ERROR_CON_SLICE_MV_COPY_CROSS_IDR_FREEZE_RES_CHANGE);
     m_pDecContext->eErrorConMethod = (ERROR_CON_IDC) iVal;
+    if ((m_pDecContext->bParseOnly) && (m_pDecContext->eErrorConMethod != ERROR_CON_DISABLE)) {
+      WelsLog (&m_pWelsTrace->m_sLogCtx, WELS_LOG_INFO,
+               "CWelsDecoder::SetOption for ERROR_CON_IDC = %d not allowd for parse only!.", iVal);
+      return cmInitParaError;
+    }
+
     InitErrorCon (m_pDecContext);
     WelsLog (&m_pWelsTrace->m_sLogCtx, WELS_LOG_INFO,
              "CWelsDecoder::SetOption for ERROR_CON_IDC = %d.", iVal);
@@ -551,6 +557,7 @@ DECODING_STATE CWelsDecoder::DecodeParser (const unsigned char* kpSrc,
   }
 
   m_pDecContext->iErrorCode = dsErrorFree; //initialize at the starting of AU decoding.
+  m_pDecContext->eErrorConMethod = ERROR_CON_DISABLE; //add protection to disable EC here.
   m_pDecContext->pParserBsInfo = pDstInfo;
   pDstInfo->iNalNum = 0;
   pDstInfo->iSpsWidthInPixel = pDstInfo->iSpsHeightInPixel = 0;