diff --git a/src/tsdb/src/tsdbCommit.c b/src/tsdb/src/tsdbCommit.c
index df9983c3418736e46e9179d0bcc9f09aec4f6ea3..0495ebecdd9e366911fca166b8d8f57f0be2b14f 100644
--- a/src/tsdb/src/tsdbCommit.c
+++ b/src/tsdb/src/tsdbCommit.c
@@ -777,6 +777,7 @@ static int tsdbWriteBlock(SCommitH *pCommith, SDFile *pDFile, SDataCols *pDataCo
       return -1;
     }
     pBlockData = (SBlockData *)TSDB_COMMIT_BUF(pCommith);
+    pBlockCol = pBlockData->cols + tcol;
     tptr = POINTER_SHIFT(pBlockData, lsize);
 
     if (pCfg->compression == TWO_STAGE_COMP &&