fix(tsdb): check for null ptr of pScanInfo

source/dnode/vnode/src/tsdb/tsdbRead2.c

@@ -2564,9 +2564,18 @@ static int32_t doLoadLastBlockSequentially(STsdbReader* pReader) {
 
     // load the last data block of current table
     STableBlockScanInfo* pScanInfo = *(STableBlockScanInfo**)pStatus->pTableIter;
+    if (pScanInfo == NULL) {
+      tsdbError("table Iter is null, invalid pScanInfo, try next table %s", pReader->idStr);
+      bool hasNexTable = moveToNextTable(pUidList, pStatus);
+      if (!hasNexTable) {
+        return TSDB_CODE_SUCCESS;
+      }
+
+      continue;
+    }
+
     if (pReader->pIgnoreTables && taosHashGet(*pReader->pIgnoreTables, &pScanInfo->uid, sizeof(pScanInfo->uid))) {
       // reset the index in last block when handing a new file
-      //      doCleanupTableScanInfo(pScanInfo);
       bool hasNexTable = moveToNextTable(pUidList, pStatus);
       if (!hasNexTable) {
         return TSDB_CODE_SUCCESS;
@@ -2575,9 +2584,6 @@ static int32_t doLoadLastBlockSequentially(STsdbReader* pReader) {
       continue;
     }
 
-    // reset the index in last block when handing a new file
-    //    doCleanupTableScanInfo(pScanInfo);
-
     bool hasDataInLastFile = initLastBlockReader(pLastBlockReader, pScanInfo, pReader);
     if (!hasDataInLastFile) {
       bool hasNexTable = moveToNextTable(pUidList, pStatus);