diff --git a/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java b/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java
index 63407b7..64d5602 100644
--- a/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java
+++ b/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java
@@ -88,7 +88,8 @@ public class OFResultSetRow extends OFResultSet{
         for (int  i =0 ; i< arrayColumns.size() ; ++i) {
             // replace
             String k = "$" + i;
-            String replaceString = data.get(this.meta.get(arrayColumns.get(i)));
+            int dataIndex = this.meta.get(arrayColumns.get(i);
+            String replaceString = data.get(dataIndex);
             metric = metric.replace(k,"'" + replaceString + "'");
         }