diff --git a/src/tsdb/src/tsdbRWHelper.c b/src/tsdb/src/tsdbRWHelper.c
index 84f22918ecb8776bf52c262be913b72253dc688f..632d2995428886cfa9d821a070462a43e87e58b7 100644
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@@ -733,7 +733,7 @@ static int tsdbWriteBlockToFile(SRWHelper *pHelper, SFile *pFile, SDataCols *pDa
   int32_t lsize = tsize;
   int32_t keyLen = 0;
   for (int ncol = 0; ncol < pDataCols->numOfCols; ncol++) {
-    if (tcol >= nColsNotAllNull) break;
+    if (ncol != 0 && tcol >= nColsNotAllNull) break;
 
     SDataCol *pDataCol = pDataCols->cols + ncol;
     SCompCol *pCompCol = pCompData->cols + tcol;