diff --git a/src/main/java/com/loafle/overflow/crawler/result/OFResultSetCol.java b/src/main/java/com/loafle/overflow/crawler/result/OFResultSetCol.java
index 1131691..8629e57 100644
--- a/src/main/java/com/loafle/overflow/crawler/result/OFResultSetCol.java
+++ b/src/main/java/com/loafle/overflow/crawler/result/OFResultSetCol.java
@@ -30,6 +30,9 @@ public class OFResultSetCol extends OFResultSet{
 
         if( arrayColumns != null) {
             for( int indexI = 0 ; indexI < arrayColumns.size(); ++indexI) {
+                if(this.meta.containsKey(arrayColumns.get(indexI))) {
+                    continue;
+                }
                 this.meta.put(arrayColumns.get(indexI), indexI+ meta.size());
             }
         }