diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index ce781b2eec5f0d3fb1645fd4ad045a5ccf7bb719..8f4b23ec164eee5a5b9cad10567a96a4201483e2 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -50,7 +50,8 @@ int tdSchemaAddCol(STSchema *pSchema, int8_t type, int16_t colId, int32_t bytes)
   if (pSchema->numOfCols == 0) {
     colSetOffset(pCol, 0);
   } else {
-    colSetOffset(pCol, pSchema->columns[pSchema->numOfCols - 1].offset + TYPE_BYTES[type]);
+    STColumn *pTCol = pSchema->columns + pSchema->numOfCols - 1;
+    colSetOffset(pCol, pTCol->offset + TYPE_BYTES[pTCol->type]);
   }
   switch (type) {
     case TSDB_DATA_TYPE_BINARY: