diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index b556733254ae96ae4c7aac2005bd5116d53d6846..94c5b2e0b7ac1542542ee769a831d0f6124ba2a7 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1573,7 +1573,7 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
         qError("submit msg messed up when initing stream submit block %p", pSubmit);
         pInfo->tqReader->pMsg = NULL;
         pTaskInfo->streamInfo.pReq = NULL;
-        ASSERT(0);
+        return NULL;
       }
     }
 
@@ -1628,11 +1628,14 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
   if (pTaskInfo->streamInfo.prepareStatus.type == TMQ_OFFSET__LOG) {
     while (1) {
       SFetchRet ret = {0};
-      tqNextBlock(pInfo->tqReader, &ret);
+      if (tqNextBlock(pInfo->tqReader, &ret) < 0) {
+        qError("failed to get next log block since %s", terrstr());
+        return NULL;
+      }
       if (ret.fetchType == FETCH_TYPE__DATA) {
         blockDataCleanup(pInfo->pRes);
         if (setBlockIntoRes(pInfo, &ret.data, true) < 0) {
-          ASSERT(0);
+          return NULL;
         }
         if (pInfo->pRes->info.rows > 0) {
           pOperator->status = OP_EXEC_RECV;
@@ -1640,7 +1643,8 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
           return pInfo->pRes;
         }
       } else if (ret.fetchType == FETCH_TYPE__META) {
-        ASSERT(0);
+        qError("unexpected ret.fetchType:%d", ret.fetchType);
+        return NULL;
         //        pTaskInfo->streamInfo.lastStatus = ret.offset;
         //        pTaskInfo->streamInfo.metaBlk = ret.meta;
         //        return NULL;
@@ -1667,7 +1671,7 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
     return NULL;
 #endif
   } else {
-    ASSERT(0);
+    qError("unexpected streamInfo prepare type: %d", pTaskInfo->streamInfo.prepareStatus.type);
     return NULL;
   }
 }
diff --git a/source/libs/wal/src/walRead.c b/source/libs/wal/src/walRead.c
index 0f8f140bd8a2a24e82f997b0029b8b946b1f2f1b..5e09af5b2e9e8e5c55eb8e3f4414ecd48582f6b9 100644
--- a/source/libs/wal/src/walRead.c
+++ b/source/libs/wal/src/walRead.c
@@ -241,7 +241,6 @@ static int32_t walFetchHeadNew(SWalReader *pRead, int64_t fetchVer) {
 
   if (pRead->curInvalid || pRead->curVersion != fetchVer) {
     if (walReadSeekVer(pRead, fetchVer) < 0) {
-      ASSERT(0);
       pRead->curVersion = fetchVer;
       pRead->curInvalid = 1;
       return -1;
@@ -262,7 +261,6 @@ static int32_t walFetchHeadNew(SWalReader *pRead, int64_t fetchVer) {
       } else {
         terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
       }
-      ASSERT(0);
       pRead->curInvalid = 1;
       return -1;
     }
@@ -299,7 +297,6 @@ static int32_t walFetchBodyNew(SWalReader *pRead) {
       terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
     }
     pRead->curInvalid = 1;
-    ASSERT(0);
     return -1;
   }
 
@@ -308,7 +305,6 @@ static int32_t walFetchBodyNew(SWalReader *pRead) {
            pRead->pHead->head.version, ver);
     pRead->curInvalid = 1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
-    ASSERT(0);
     return -1;
   }
 
@@ -316,7 +312,6 @@ static int32_t walFetchBodyNew(SWalReader *pRead) {
     wError("vgId:%d, wal fetch body error:%" PRId64 ", since body checksum not passed", pRead->pWal->cfg.vgId, ver);
     pRead->curInvalid = 1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
-    ASSERT(0);
     return -1;
   }
 
@@ -335,7 +330,6 @@ static int32_t walSkipFetchBodyNew(SWalReader *pRead) {
   if (code < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
     pRead->curInvalid = 1;
-    ASSERT(0);
     return -1;
   }
 
@@ -384,7 +378,6 @@ int32_t walFetchHead(SWalReader *pRead, int64_t ver, SWalCkHead *pHead) {
       } else {
         terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
       }
-      ASSERT(0);
       pRead->curInvalid = 1;
       return -1;
     }
@@ -447,7 +440,6 @@ int32_t walFetchBody(SWalReader *pRead, SWalCkHead **ppHead) {
 
   if (pReadHead->bodyLen != taosReadFile(pRead->pLogFile, pReadHead->body, pReadHead->bodyLen)) {
     if (pReadHead->bodyLen < 0) {
-      ASSERT(0);
       terrno = TAOS_SYSTEM_ERROR(errno);
       wError("vgId:%d, wal fetch body error:%" PRId64 ", read request index:%" PRId64 ", since %s",
              pRead->pWal->cfg.vgId, pReadHead->version, ver, tstrerror(terrno));
@@ -457,12 +449,10 @@ int32_t walFetchBody(SWalReader *pRead, SWalCkHead **ppHead) {
       terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
     }
     pRead->curInvalid = 1;
-    ASSERT(0);
     return -1;
   }
 
   if (pReadHead->version != ver) {
-    ASSERT(0);
     wError("vgId:%d, wal fetch body error, index:%" PRId64 ", read request index:%" PRId64, pRead->pWal->cfg.vgId,
            pReadHead->version, ver);
     pRead->curInvalid = 1;
@@ -471,7 +461,6 @@ int32_t walFetchBody(SWalReader *pRead, SWalCkHead **ppHead) {
   }
 
   if (walValidBodyCksum(*ppHead) != 0) {
-    ASSERT(0);
     wError("vgId:%d, wal fetch body error, index:%" PRId64 ", since body checksum not passed", pRead->pWal->cfg.vgId,
            ver);
     pRead->curInvalid = 1;