diff --git a/src/main/java/com/loafle/overflow/crawler/result/OFResultSet.java b/src/main/java/com/loafle/overflow/crawler/result/OFResultSet.java
index ad66770..4ceadba 100644
--- a/src/main/java/com/loafle/overflow/crawler/result/OFResultSet.java
+++ b/src/main/java/com/loafle/overflow/crawler/result/OFResultSet.java
@@ -1,6 +1,7 @@
 package com.loafle.overflow.crawler.result;
 
 import com.loafle.overflow.crawler.config.Item;
+import com.loafle.overflow.crawler.config.MappingInfo;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -42,6 +43,9 @@ public abstract class OFResultSet {
 
     // methods
     static public OFResultSet newInstance(Item item) {
+        if (item.getMappingInfo() == null) {
+            item.setMappingInfo(new MappingInfo());
+        }
         String type = (String) item.getMappingInfo().getParseDirection();
         if (type != null && type.equals("row")) {
             return new OFResultSetRow(item);
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 5757aaa..b5371e2 100644
--- a/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java
+++ b/src/main/java/com/loafle/overflow/crawler/result/OFResultSetRow.java
@@ -77,7 +77,7 @@ public class OFResultSetRow extends OFResultSet{
         for (String keyColumn: keyColumns) {
             String row = data.get(this.meta.get(keyColumn));
             for (int i =0 ; i < keys.size() ; ++i) {
-                if (row.equals(keys.get(i))) {
+                if (row.equals(keys.get(i).getKey())) {
                     findIndex = i;
                     find = true;
                     break;