diff --git a/src/client/src/tscParseInsert.c b/src/client/src/tscParseInsert.c
index 8873169e1e..48423417e7 100644
--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@@ -447,7 +447,7 @@ int tsParseOneRowData(char **str, STableDataBlocks *pDataBlocks, SSchema schema[
         tmpTokenBuf[j] = sToken.z[i];
         j++;
       }
-      
+      tmpTokenBuf[j] = 0; 
       sToken.z = tmpTokenBuf;
       sToken.n -= 2 + cnt;    
     }