diff --git a/codec/decoder/core/src/au_parser.cpp b/codec/decoder/core/src/au_parser.cpp
index 09cdaed4..5912d25a 100644
--- a/codec/decoder/core/src/au_parser.cpp
+++ b/codec/decoder/core/src/au_parser.cpp
@@ -271,7 +271,9 @@ uint8_t* ParseNalHeader (PWelsDecoderContext pCtx, SNalUnitHeader* pNalUnitHeade
 
         if (uiAvailNalNum > 1) {
           pCurAu->uiEndPos = uiAvailNalNum - 2;
-          pCtx->bAuReadyFlag = true;
+          if (pCtx->eErrorConMethod == ERROR_CON_DISABLE) {
+            pCtx->bAuReadyFlag = true;
+          }
         }
         pCtx->iErrorCode |= dsBitstreamError;
         return NULL;
@@ -291,7 +293,9 @@ uint8_t* ParseNalHeader (PWelsDecoderContext pCtx, SNalUnitHeader* pNalUnitHeade
 
         if (uiAvailNalNum > 1) {
           pCurAu->uiEndPos = uiAvailNalNum - 2;
-          pCtx->bAuReadyFlag = true;
+          if (pCtx->eErrorConMethod == ERROR_CON_DISABLE) {
+            pCtx->bAuReadyFlag = true;
+          }
         }
         pCtx->iErrorCode |= dsBitstreamError;
         return NULL;
@@ -340,7 +344,9 @@ uint8_t* ParseNalHeader (PWelsDecoderContext pCtx, SNalUnitHeader* pNalUnitHeade
       ForceClearCurrentNal (pCurAu);
       if (uiAvailNalNum > 1) {
         pCurAu->uiEndPos = uiAvailNalNum - 2;
-        pCtx->bAuReadyFlag = true;
+        if (pCtx->eErrorConMethod == ERROR_CON_DISABLE) {
+          pCtx->bAuReadyFlag = true;
+        }
       }
       WelsLog (pLogCtx, WELS_LOG_ERROR, "NAL_UNIT_CODED_SLICE: InitBits() fail due invalid access.");
       pCtx->iErrorCode	|= dsBitstreamError;
@@ -357,7 +363,9 @@ uint8_t* ParseNalHeader (PWelsDecoderContext pCtx, SNalUnitHeader* pNalUnitHeade
 
       if (uiAvailNalNum > 1) {
         pCurAu->uiEndPos = uiAvailNalNum - 2;
-        pCtx->bAuReadyFlag = true;
+        if (pCtx->eErrorConMethod == ERROR_CON_DISABLE) {
+          pCtx->bAuReadyFlag = true;
+        }
       }
       pCtx->iErrorCode |= dsBitstreamError;
       return NULL;
diff --git a/codec/decoder/core/src/decoder.cpp b/codec/decoder/core/src/decoder.cpp
index 208ef57b..5fe6d1b6 100644
--- a/codec/decoder/core/src/decoder.cpp
+++ b/codec/decoder/core/src/decoder.cpp
@@ -626,23 +626,25 @@ int32_t WelsDecodeBs (PWelsDecoderContext pCtx, const uint8_t* kpBsBuf, const in
           pDstNal[iDstIdx] = pDstNal[iDstIdx + 1] = pDstNal[iDstIdx + 2] = pDstNal[iDstIdx + 3] =
                                0; // set 4 reserved bytes to zero
           pNalPayload	= ParseNalHeader (pCtx, &pCtx->sCurNalHead, pDstNal, iDstIdx, pSrcNal - 3, iSrcIdx + 3, &iConsumedBytes);
-          if (IS_VCL_NAL (pCtx->sCurNalHead.eNalUnitType, 1)) {
-            CheckAndFinishLastPic (pCtx, ppDst, pDstBufInfo);
-          }
-          if (IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType) && pNalPayload) {
-            iRet = ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes, pSrcNal - 3, iSrcIdx + 3);
-          }
-          if (pCtx->bAuReadyFlag) {
-            ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
+          if (pNalPayload) { //parse correct
+            if (IS_VCL_NAL (pCtx->sCurNalHead.eNalUnitType, 1)) {
+              CheckAndFinishLastPic (pCtx, ppDst, pDstBufInfo);
+            }
+            if (IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType)) {
+              iRet = ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes, pSrcNal - 3, iSrcIdx + 3);
+            }
+            if (pCtx->bAuReadyFlag) {
+              ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
 
-            if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
+              if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
 #ifdef LONG_TERM_REF
-              pCtx->bParamSetsLostFlag = true;
+                pCtx->bParamSetsLostFlag = true;
 #else
-              pCtx->bReferenceLostAtT0Flag = true;
+                pCtx->bReferenceLostAtT0Flag = true;
 #endif
-              if (dsOutOfMemory & pCtx->iErrorCode) {
-                return pCtx->iErrorCode;
+                if (dsOutOfMemory & pCtx->iErrorCode) {
+                  return pCtx->iErrorCode;
+                }
               }
             }
           }
@@ -682,22 +684,24 @@ int32_t WelsDecodeBs (PWelsDecoderContext pCtx, const uint8_t* kpBsBuf, const in
     pDstNal[iDstIdx] = pDstNal[iDstIdx + 1] = pDstNal[iDstIdx + 2] = pDstNal[iDstIdx + 3] =
                          0; // set 4 reserved bytes to zero
     pNalPayload = ParseNalHeader (pCtx, &pCtx->sCurNalHead, pDstNal, iDstIdx, pSrcNal - 3, iSrcIdx + 3, &iConsumedBytes);
-    if (IS_VCL_NAL (pCtx->sCurNalHead.eNalUnitType, 1)) {
-      CheckAndFinishLastPic (pCtx, ppDst, pDstBufInfo);
-    }
-    if (IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType) && pNalPayload) {
-      iRet = ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes, pSrcNal - 3, iSrcIdx + 3);
-    }
-    if (pCtx->bAuReadyFlag) {
-      ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
+    if (pNalPayload) { //parse correct
+      if (IS_VCL_NAL (pCtx->sCurNalHead.eNalUnitType, 1)) {
+        CheckAndFinishLastPic (pCtx, ppDst, pDstBufInfo);
+      }
+      if (IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType)) {
+        iRet = ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes, pSrcNal - 3, iSrcIdx + 3);
+      }
+      if (pCtx->bAuReadyFlag) {
+        ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
 
-      if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
+        if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
 #ifdef LONG_TERM_REF
-        pCtx->bParamSetsLostFlag = true;
+          pCtx->bParamSetsLostFlag = true;
 #else
-        pCtx->bReferenceLostAtT0Flag = true;
+          pCtx->bReferenceLostAtT0Flag = true;
 #endif
-        return pCtx->iErrorCode;
+          return pCtx->iErrorCode;
+        }
       }
     }
     if (iRet) {
diff --git a/codec/decoder/core/src/decoder_core.cpp b/codec/decoder/core/src/decoder_core.cpp
index 6332f83d..69b8884b 100644
--- a/codec/decoder/core/src/decoder_core.cpp
+++ b/codec/decoder/core/src/decoder_core.cpp
@@ -2140,6 +2140,8 @@ int32_t DecodeCurrentAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBuf
 
 bool CheckAndFinishLastPic (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferInfo* pDstInfo) {
   PAccessUnit pAu = pCtx->pAccessUnitList;
+  if (pAu->uiAvailUnitsNum == 0)
+    return true;
   PNalUnit pCurNal = pAu->pNalUnitsList[pAu->uiEndPos];
   if ((pCtx->iTotalNumMbRec != 0)
       && (CheckAccessUnitBoundaryExt (&pCtx->sLastNalHdrExt, &pCurNal->sNalHeaderExt, &pCtx->sLastSliceHeader,