diff --git a/src/tsdb/src/tsdbRWHelper.c b/src/tsdb/src/tsdbRWHelper.c
index ebecf887d3168f8e98f6f070b5ba9f44b94979d2..829d7ab3fd7ba66859d28939a47bae8e241a1688 100644
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@@ -701,6 +701,8 @@ static int tsdbWriteBlockToFile(SRWHelper *pHelper, SFile *pFile, SDataCols *pDa
       continue;
     }
 
+    memset(pCompCol, 0, sizeof(*pCompCol));
+
     pCompCol->colId = pDataCol->colId;
     pCompCol->type = pDataCol->type;
     if (tDataTypeDesc[pDataCol->type].getStatisFunc) {